Hand assembled and hand polished in a Grand Seiko studio. Could never find this level of quality in say, Rolex or Omega. This watch worth every penny. 👍👍👍

Have the same sla021. On 6.5 it wears insanely good. It's such a beautiful monster. And it's size brings something special to the wear experience.

I have it on my wrist for a while, and yes, definitely, it is a Grand Seiko class in the form of an iconic designed diver watch. True to origin, loyalty of the past but with modern applications such as Zirconia Ceramic insert, sapphire inner single dome, Grand-Seiko-level Zaratsu polishing. Specially the un-decorated and un-adjusted GS movement 8L35 which deliverd an outstanding accuracy (for me is just over 1s per day), with the price just half of the tag from those GSs. No doubt at all, this is a GS in the form of a classic, iconic diver timepiece.

Re-bought a sbdx001 one year after I sold it. I thought it was too big, but it isn’t! Love this watch - one of the coolest in the industry! Thanks for a really good review!

Owned the sla021 for over a year. Wore it with bracelet up until last month. It felt good on my 7.25" wrist and the quick adjust clasp was great on hot days with wrist swelling. I switched to the silicone rubber strap and it looks sporty. Accuracy has been consistent at + 6 sec per day. No complaints. This watch gets more wrist time than both my Omega Seamaster PO's combined. May have to sell one.

I've become a seiko convert recently. I was tunnel visioned for many years of thinking the brand is just generic as I only owned seiko5s, skx, and a few turtles. However i see the brand differently these days and see their high end comparable if not better than many omega, tudor, tag et al models of the same price point.

I've had my Marinemaster since 1999. Still going strong. Sent it in for service a number of times. I put it on the Timegrapher and it as running at only a couple seconds a day. Strong as nails, very wearable.

I bought this because I still believe seiko divers are nicer than GS divers

This is an awesome watch, so underrated! The indices are not applied, it’s bumped up from the dial, which is a harder technique to achieve and to make sure that the indices won’t fall off from the dial. This watch is so amazing.

The Lume on this thing is literally insane ! Great video and incredible watch

nice review... I'm a proud owner of the mm300, and I love everything in it ... including how heavy it weights on my wrist ... my only concern about this fantastic watch is the lume on the ceramic bezel ... which is painted and unprotected. just hoping that it withstood the years of use and abuse.

I wear my SBDX017 on a black Isofrane. Insanely comfortable and the thickness of the strap compliments the tall case proportions.

Just picked one up. Good stuff.

Another excellent review. Made me miss my dearly departed 001. Great point re: its ever-increasing value proposition.

Love this watch! Marinemaster text on the dial makes the old one look imbalance and cluttered! This one clean symmetrical lines! Quality all around!! Love SLA021

I love my SLA059. Wear it daily.

I owned a Seiko turtle, loved the look but not impressed with +15 sec per day. Sold it and gave Seiko one more try with the SLA021. It's my favorite watch, and I own a Casio MTG, Omega Seamaster 300m and two Omega Seamaster Planet Oceans. The SLA021at +6 sec/day is not as accurate as my other watches, but the look and feel on my 7.25" wrist is perfect. Others have complained about the bracelet, but I like it.

Love it, beautiful. Really top quality. I would take this watch over Rolex and grand seiko it has that special thing that watch watch collectors and watch lover see in few rare watches. If a non collector or watch enthusiast saw this watch would never understand or accept a $3000 seiko but to watch lovers like us we see the value there and even think it should be higher. Love the fact that it’s got a grand seiko movement. On the wish list, saving up to buy one🙏.👌👌👍

Just ran across this review......late to the party. Great review. I started my Seiko journey with a skx. Bought monsters, turtles, Willards, samurai, sumo, and shogun. Have some real nice micro divers also. Then took the plunge into the sla line. The grail for me was the sla039. The hb was running 14 + sec a day so the dealer sent it back to Japan for service. Hopefully get it back in a couple of weeks more. Been 6 weeks already. Other than that a stunning, easy to wear watch. I missed it so much that when a real deal came up from the same dealer on a 059, I bought a second mm300. It is beyond stunning! Have to see in person. Got a great fit on the bracelet. Going to stay on it. Think it balances out the heavy head. This mm300 has become my favorite, most worn watch in my collection. I am totally hooked on the mm300 watches. Unique diver in the masses . Interesting how small they actually wear on the wrist. Smaller than my samurai, or turtles.

I bought the SBDX001 in 2002 for app. 135kYEN. Service so far in 2014 in JAPAN. It is a love / hate relation ship ever since i bought it. Its great looking watch, but after 2-3 days with all the extra weight on my hand it gets back into the case. The original bracelet and clasp is pain to use. I never managed to take off the watch without changing the clasp dive adjustment. With a thick rubber or leather strap the watch is manageable. Personally i'm a lot happier with a Omega Seamaster 300 MC from 2014 ( not the toothpaste Bond watch) as my daily wearer. For the current price of the SLA021 there a better options: Breitling SuperOcean 42, Tudor BlackBay 41 or Pelagos. Used Seamster Professional. I would not spent the current price of 5400 AUD on the MarineMaster SLA021.

I know what you mean about heavy watches. I've been wearing an old Casio for almost 20 years, but I can't wait to take it off.

Good review! My favourite watch of all time. I just reviewed it myself, after 1 year ownership. Still going strong and it is still in my current rotation.

I know some people buy them and sell right away because the accuracy was not inspiring. I think that's their mistake and that could be to your benefit. Brand new upon first winding I was looking at about +11 seconds a day. It only took a few days to notice that it's accuracy improved every time I measured it. After about three months of daily wear in time on my wrist it has greatly improved. The last time I timed it against an atomic radio watch the SBDX023/SLA021 averaged +3.58 seconds a day over a period of 100 hours. I'm really happy with it now. It's still slowing but it's almost imperceptible now. My worry is, that if I ever send it in for service, I don't want it coming back running so fast again. But as long as it's not slow, I have one slow watch, I love it, but it's a pain in the arse. I if you like this Seiko but your not sure if it's worth it. Just buy it, it is very nice. If you don't like it, they sell pretty quickly online.

The mm300 bracelet is great it just needs adjustment properly. The 6oclock side needs to be 2 links shorter than the 12oclock side to sit properly. The clasp length needs to be taken notice of.

Owned mone for 4 months now. TBH when I first got it I didn't love it. However.... it has grown on me and I now wear it more often than any other diver I own. Furthermore, I frequently wear it on its OWM bracelet that is actually perfectly well designed, it just needs to be properly fitted and properly adjusted. It wears smaller than my 62MAS which is technically a smaller watch.

Best-looking watch out there in my opinion. There is nothing else quite like it. And the lume is otherworldly good.

Totally second your statement on bargain GS > expensive Seiko. I'm more convinced with the SLA043J1 Island green after having blocked the GS SBGE257 with the AD. This tugs at the heart more than any GS could do, for now. Best watch pound for pound. I'll go for this and update the thread.

Replaced the bracelet with an aftermarket with shorter links. Strapcode Hexad also allowed me to replace their clasp with the MM300 clasp. Someone else's idea. Works for me really well ...as the bracelet link-length was my only dislike.

They're awesome. I own the original and have done twice, and the 600, and the Black one, and I'm saving for the LX. The lightplay is awesome, when you roll your wrist and the light hits those indicies, woweeeee.... They explode !!! Throw a black band on it and the B&W contrast is incredible.. Awesome watches.

This is such a good review. I can tell you live this watch fondly and I get that. Now I really want to work and go get one.

Wonderful review, gorgeous watch. Many thanks! 🙏😊😊❤❤❤❤

Just bought this watch and it is a great piece, I also received a 30% discount so I was thrilled as well. Great video on the watch, one of the best I have seen.

Great video. I have the blue one with a black rubber crafter blue band. It's a gorgeous combination. Love wearing it

That description of the brightness of the lume is ROFL wow

My buddy recently picked up this watch and he likes it very much. I agree with you on Grand Seiko. I have the GMT. 👍😀

Excellent, excellent review!

This is one of those watches that I love and appreciate but I still can't get past the price and the competition. I'll admit that I've yet to see one in person tho

I like the SLA021, but I couldn't stand how the indices are always yellow-green color. I like a stark white.

A well done and balanced video, thank you for posting. For me at the end of the day it is a dive watch, a tool watch, I'm not that bothered about super brilliant zaratsu (sp?) polishing for this although I can certainly appreciate the time it takes to train the hand polisher and the great expertise in this finish. As I have the Tudor Pelagos this does not bring much extra to the table for me but it is a great piece though. If I didn't have the Pelagos I would take a look but would probably still pull the trigger on the Tudor on this occasion. Keep up the good work!

hi nice video, !!! I'm undecided whether to buy this or the TUDOR black bay pro. What do you recommend??

Phenomenal video man!

As a SPB383 owner.. I might sell my watch and go for this timeless beauty instead

Awesome seiko and such beautiful lume, the marine master is a little rich for my blood though, but I can settle for my SKX007.

Same movement but don't forget that the Grand Seiko movement tax also includes a very precise calibration that is not on the mm300.

just ordered one, thanks for the review

If u have an skx definitely u want a better one and then a better one again. The hunger for a better one keeps on going.

How much does yours sound like you're winding up a kid's toy when you're winding it? Mine does quite a bit. It's not a bad thing necessarily, but I was surprised a watch at this price point and quality level does that. My other watches at similar quality levels are smooth and almost silent when I wind them.

Glad I saw this video, I just purchase a proxima which is a homage to this watch for $200 just to see if I would like wearing it and enjoying it before the the bigger price commitment

A very nice, honest and detailed review.

Great review. Just ordered one myself. Cannot wait!

OK - What about crown thread being made thet way that When it breakes eventually you have to reolace whole case for 700usd? What about eutomatic winding lever - breaking? What about lube at 12 on bezel not being protected? No one talks about servicing costs.. and so on..

How does this wear compared to a Panerai? I know you have/had one, hence my question. I had a 44mm Submersible, but sold it because I found it top-heavy. I think this is because of the heave ETA 7750 based movement. I have no problems with a 45mm Seiko Turtle...

I have seen so many videos of this watch and I love it more and more! I have a Sumo special edition, a Samurai Mantaray and some others too, but tomorrow I will drive 500 km to get my "first" MM 300. A black one, how it has to be and it´s used but in fantastic good shape and original. That´s what you get for the money for this watch, is the best you can get for money for a watch!

Compared to their latest Prospexes, this is real value. At least it's got a competitive movement. 6R and 4R just don't cut it in +1000$ watches anymore.... You can buy Longines for the price of the new Willard.

there is a difference between these and the LX / GS line but its not worth paying the extra. The dial, hands, indices and movement are the main difference i see handling them.

Soooooo....is it really a bargain GS or still just an expensive Seiko??

Superb review. Many thanks!

This watch is most surely one that someway I'll own one to go with my other seiko divers watches this will be the top of all 3.000 plus really is in my capabilities the overall look of the Is Marine Master 300 would look great on my larger size reist. Very good review

I’m sorry i didn’t understand did you upgrade it to flat sapphire or it came with it?if you upgraded it can you please tell from where?Thank you.Also this watch isn’t 44.3 mm?

I had this going while refinishing a tabletop. Wearing a Turtle Pepsi at the moment. One day…

Best diver, enters my top 5 watches to own! Better than GS diver only sub as a competition!

I like the way you put it with the higher more expensive seikos . Think of it as a less expensive grand Seiko. I to also have two grand Seiko

have it in blue dial … gorgeous piece

Best hands ever. I put nice (and pricey:) MM-style hands on my Turtle and two microbrand watches, and all look amazing.

I got an snr043, love it. Suggest you try a 43 or a 29. Bit more moola but perfectly fixes those little negatives! Still - sweet watch, I love it as well

I’m picking one up used from someone I know and I can’t wait!

This watch is a bargain! 😊Gorgeous!🥰

After wearing this as a daily beater for almost 2 years. I can't say it's worth it. On a bracelet it's to heavy, the bracelet is shit for this price really poor stuff. The bezel action is bad, either it's good one day or to stiff nothing in between. The lumepip is not "covered" and gets marks and looks really bad for the price. Get a Tudor for you're money

I have mixed feeling about MM300. I owned few versions of MM300. All of them have issue with accuracy. But the the flip-trigger has always being the weight.

Another great quality video! What made you choose this one over the 001 besides specifics as the Sapphire, ceramic bezel etc?

For $2800 it's definitely a pass. But I got mine brand new many years ago for $2300 shipped and after taxes. That is worth it.

007 on a strap code super oyster got me to sell my 001. A total mistake till I finally got the 021. Allowed me to let the og blumo and 007 go. Kept the OM and spork and 021.

Beautiful piece for sure!

Would love to get my hands on that MM spring drive.

i have the SLA019 and love it but hate it for the poking you mentioned :D will put it back on the rubber now

How you guys wear this watch and didnt have any scratches, for me is enought 10 days to got some micro ones everywhere haha, I think most buyers didnt use this watch at all and buying to sell later

Great video on this outstanding Seiko watch. To me this is the ultimate grail watch .

I have the green limited to 1986 and the Blue Dolphins limited to the 300 (exclusive to Asia). Which one would I sell whenever I need some funds. I love both of them, but I am also thinking about value retention.

Is it really assembled in GS factory? Mine came with so many dust inside. I even see some in your MM300 vs Pelagos video. Lol. But not really sure if that's a metric to really prove where it's assembled. AFAIK, it's only the movement that's assembled in GS. Anyone?

Hey man good video and that is a great watch. I think it's great you got the older one that says marine master on it. Have you been able to compare it to the newer models?

May I know the model of the rubber strap?

Wonderful vid. I will never accept a crown at 4 (an abomination- lol) and the dial might be a tad too big but overall, and for a type of model that is not my cup of tea (I only use divers as timers when cooking, so the Chinese homages are perfect for me LMAO), overall, it is pretty convincing; It's the overall that makes it; Keep up the great wrok!

Hi. Does the triangle pip have a coating on it to prevent the lume from being scratched? or is the lume material exposed?

Nice Video, I am thinking of getting a MM300. I also got a Pelagos and I am loving the Pelagos.But what about the accuracy of the MM? A comparing video Pelagos vs MM would be nice. Thanks.Michael from germany

Damn, killer reviews. The thickness is the main thing for me on this one, feels little too heavy. keep the reviews coming!

That 8L35 movement looks plenty decorated to me. 🤡 Hand assembled by a master watchmaker the Seiko movement far exceeds the Rolex perpetual IMO.

What’s the daily accuracy of the mm300?can the watch fit in small size wrist?any special maintenance needed for the watch?can the watch go 15 years without service if we can use once a week?

You only look at the date window once a day hopefully.

14:33 "just go for it" So i bought the SNR029 😅

Hi, i bought my first Seiko monster Antarktika to celebrate applying to my dream collage back im 2021. After a year my father took it because i started my weight loss jorney so i bought fitness tracker(: I am starting to Save up for sla 023 j1 i o have it im 2-3 years period, 10% is qlready saved(: Do you need to send it to Japan to service it and what are the costs?

For less than 3 grand for a hi beat movement is really a bargain

If anything, it actually looks small on you! Great review, thnx

Such a great watch! I was curious also with your Grand Seiko pieces, especially the one on the beads of rice bracelet. Which reference is that?

No Swiss diver at this price point is anywhere near the MM, heck I’d say even 4x the price.

nice watch... not sure i would like to pay that for a seiko , would like to know whats the accuracy ? cheers

Late to the party but great review and wholeheartedly agree. So much so that I actually own 2 MM300 🤷‍♂️

The burrs on the unfinished seconds hand, especially visible when light catches their random locations and angles, look really terrible. Let's this watch down for me and I expect much more than seeing any stamped unfinished hands at this price point. There are microbrand watches which do this so much better, for a fraction of the price.

Hour Markers are actually pushed from the back of the dial and not applied.

Seiko MM 300 nuclear watch I own a black sba0351j black stealthy for 1 year plus never fail to amaze me last but not least nuclear vid!!

In titanium it would be good Otherwise just not useable too big too heavy Also unserviceable thanks to seiko not sharing parts to local watchmakers As a.value proposition these days its not worth it That said neither is rolex or omega My King Turtle is ok for me Nice review though and it does.look fantastic