This is the mark of an honest business person. Everything is shown and an honest assessment and recomendation is given. If only more people acted in such a fashion....

Nato straps for water.

Man oh man it must be tough to just stop there and resist the temptation to rip into it. If only for curiosity sake! I do hope the customer decides to have that watch repaired, it's a beauty!

Thank you for sharing the opening. I too thought it would have been much much worse than it is. How deep are the pockets for the rebuild of this. I can see it being very expensive to repair, but what a story to go with it. To have that running accurately and on the wrist again would be a great story. If it were mine in that situation, I'd be crazy enough to get it fixed just for the story, but that's me, and my wife would kill me for it. Lol Tough decision for the owner I'm sure. Please keep us posted as to what happens. Great video Spencer.

Hello Spencer. I didn't expect that! How could water even get into a Marinemaster!🤔 So I think that something like that shouldn't actually happen with a €3000 watch!# She couldn't have been in the water for that terribly long, as there weren`t any crystalline deposits to be seen. And if she was found on the beach, she certainly wouldn't have been lost far from the beach. But it's true, the place where the band was damaged is clearly the weakest link on the band and mine was already broken! Think I'd better do not leave mine on my wrist while swimming, but instead take my Homage watch from Steeldive.😎 But thanks a lot for open the watch, so I could see the "machine" for the very first time!😃

That was an epic case opening, Spencer. The barnacles should've been left intact, and then the entire watch be suspended in a lucite cube. A Modern Art Masterpiece for the mantlepiece! Although it'd be cool if the original owner of the watch saw this video and was like "Spencer, money is no object, you MUST resurrect my lost watch for me!" LOL

Been waiting for this one. Awesome!

a citizen challege diver was lost in 1977 then found on an australian beach in 1983 covered in barnacles ..........it still worked ..........and this is a MARINEMASTER ????

Hi Spencer, I really enjoy watching your videos. I have a question regarding a 7010 Tuna can. I was lucky enough to find one at an antique store in mint condition. When I went to replace the battery one of the stepped screws launched into oblivion. Luckily I was able to find a replacement on eBay. The issue is, the new screw went in but doesn't tighten it just keeps spinning. And Unfortunatel it won’t back out. Any idea what happened and how I can remove the screw? Thanks for any help you can offer.

To me it did not look as bad as I thought it would inside, I was expecting to see a solid lump of rust for a movement, also the dial looked pretty good considering it had been in the sea for some time. Cheers for sharing that grand opening we have all been waiting for.

Awesome case opening. Truly great to see how it's done. I own the same watch as well. Thank you as well for tracing and highlighting the issues from the bracelet SB to the gasket failure. It may be costly to restore this. It may be better for the owner to procure a pre-owned one. Shopping in japan has a brand new one for sale.

Oh my god been waiting for this since I saw it.. good luck 😮

How could you not attempt to resurect it, you know you want to save it?

Is the ring that takes the whole watch apart and holds everything in left hand threaded?

What tool did you use to get the bezel off, a bezel knife or something fancier? Did I see right that the face of the case was removed by turning it clockwise?

Is the MM300 suposse to withstand 300 m water pressure?. Found it on the beach sound not more than 10 m water depth.

How did the case fail? I mean, crown was threaded in, so... what happened? Static water pressure well below the 300M shouldn't cause the pressure vessel to fail. Did the salt water rust cause the seals and gasket system to fail?

Why are Seiko bracelets still so flimsy? On a high end Prospex model, that should have not been a failure point on a watch being used as intended.

great video

300 mm 다이버 제품 오픈 하는 이영상으로 처음 보는데 궁금증이 해결 되었습니다. 정말 잘 보았습니다. 굿~~

Can't believe an apex modern Seiko diver didn't remain airtight but a Citizen covered in barnacles did.

I would love to see this restored!

All the more reason to use a NATO strap. Great video.

So the seals failed? I realize this was found in the most ridiculous of circumstances but forgive for thinking that still should not have happened. This watch isn't _that_ old.

It is really weird seeing what appears to be a 2015 MM300 in this condition given that 99% of them are 'safe queens' or 'desk divers'. I am truly surprised this watch has leaked. Not sure if you remember the story, but some years ago I got a 6105 that was dredged off the bottom of a river in Oregon back in the 1980s and it hadn't leaked at all. The story of how the 6105 was saved from a watery grave is almost cooler than the watch itself, and the same is true here. Would be nice to see it running again, but 8L35 parts are tough to find.

How can the watch get to this point? Was it a lack of maintenance or that it was sitting on the bottom of the ocean for a while?

A possible solution for preventing rusting once you crack a case that maintains water is a small vacuum chamber. It is the same principal as is used on residential homes, commercial buildings and automotive air conditioning units when a vacuum pump is connected to a system. All of the moisture and some of the particulate matter is drawn off.

Take of hands and dial, and put the movement in lighter fluid or someting to fluch out all salt inside the movement, to prevent more rust?

I would have expected this watch case to be better, I’ve heard stories about much worse conditions where the watches resisted better to water intrusion

DId you noticed it started to run at 10.03 in the video?

I had assumed that it would be able to handle being underwater as it is rated to 300 m. How deep was it under the water?

SBDX017 with MIMS technology. Second gen MM300 by the color the lume and the Propsex logo on the crown. The question is can you get the parts for repair for one of these? My vote, fix it. What a story if you could get it going again.

Wow, that was indeed an epic failure by the bracelet. This was very educational, thank you Spencer.

Dear owner, that's a watch with a hell of a story to tell. Please ask Our fine friend Spencer to bring it back to life.

I have a drawer with four watches in a "Spencer Klein" bag... someday...someday.

This does'nt bode well for the repputation of the watch.If it is a 300mtre rated diver how did so much water get in?Have you read a Hodinkee story by Jason Heaton regarding his finding a "cheap" watch on one of his dives and only needing minor work to get it working again

Does anyone know the fate of this watch? I can't imagine it was salvageable in any way if actions were not immediately taken upon opening.

Wow crazy yo think someone lost this beauty out in the beach

"What's the phone number that's keep calling you?" "Nobody, darling! A lunatic claims that I stole his Seiko watch."

not an expensive job, actually. it's more the craftmanship into it that makes it expensive. The parts are all easily replaceable actually.

Seiko should fix that watch no questions asked. Water damage to a flagship dive watch. That is embarrassing....

Thanks for showing us Spence, that salt water is no joke.

GREAT video, and obviously one our little community here has been waiting for. I think this is actually the first time I've ever seen a Marinemaster opened on video; considering mine is due for service this was very helpful to me personally. Tough call for the owner on what to do with it, as much as I'd love to see you work all your magic tricks on it I think I have to agree with you that it's just too far gone at this point. I do have to say this isn't a very good look for Seiko, seeing how this watch can't have spent much time near the 300m water-resistance threshold if indeed any at all. Compare this result to the 1977 Citizen 52-0110 Challenge Diver found off Long Reef Beach in Australia in 1983 that was unbreached and still running, despite being so encrusted with barnacles and other sea life researchers estimated it was submerged in the South Pacific Ocean for *2-3 years*! EDIT 1: Watching this through again, is it just me or did the balance wheel actually rotate a few times times at 8:40?? EDIT 2: Also, note the change in the position of the seconds hand throughout the course of the video: Start = 36 2:11 = 37 5:53 = 49 9:45 = 54.5 10:03 - 10:07 = *Actually ticking* from 54.5 to 58.5 End = 58.5 Seems to me like this movement is trying very hard to run!!

Great vid Spencer 👌 I'm one of lifes great pessimists and I definitely would tell you to put that one in the bin.

Throw in an nh35 in that B lol

Sometimes you've got to face a total-loss, if the repair parts/effort/hours is going to cost more than the price of a replacement, then it's up for the owner to decide. Personally, i'd get a new Marinemaster.

It’s a $2000 watch all day. I’d put the money into it.

I agree Spencer, I would leave it alone unless a replacement movement can be sourced economically. I think it obvious you are trying to protect the owner as it will be very expensive whilst at the same time resisting the temptation to get stuck in! Maybe better just to buy a new one. I do admit i expected a block of rust but I respect your opinion and trust you always want to do right by the owner. Unless for sentimental reasons some watches just economically don't work out. Yes it's sad but we need to listen to our heads and not our hearts. I'm sure he could sell as is and make back some money back on the usable parts. If I were the owner I would never wear the same watch with that crappy bracelet EVER AGAIN. I really do expect more from Seiko's flagship diver. The bracelet is just really bad design. It just makes me start to think what watches to real divers actually wear? I really would be interested to know if you think any actually wear Seiko to go deep water diving or do they look for something else. I mean I think you will agree most new Seiko have poor accuracy tolerances out of the factory and need adjusting before they are even put on the wrist, when in fact they could be dialed in with ease by Seiko. I can't help but think accuracy is SUPER important if wanting to find out how much air you have left at 300 metres. I just wouldn't be able to trust something with my life when Seiko can't be bothered to care.

I would have hit it with a hair dryer to gently dry everything out once it was open. I"ll bet it's possible too to downgrade the movement and build a custom spacer, once the dial is saved. If it were my watch it would live on as a cheap quartz and a good story.

Put it in the freeze..

$3000 for a new one

Dis is not a cheap watch why did it leak

Hi Spencer. That tiny clasp is criminal. BTW Please look for my recent email. My Aussie Pogue has gone south. Thanks, Tom

This is why I wouldn't ever use the wetsuit extension on the MM300. Whsts happened here is hes caught the watch on a line or snagged it and the bracelet extension has failed at its weakest point. I use a NATO when wearing my MM300 on the water. If its likely to be a very harsh environment I wear an Elliot Brown on an oem bracelet. Built like a tank, super strong bracelet with integrared extension

I am starting to learn watch manufacturers have a lot of false promises to make you think their products are good but once you buy it your on your own

How about Turning it into the police station lost and found

So Elliot Brown tested one of their Bloxworth Chronographs by chucking it in Poole Harbour where they are based and leaving it under 30ft of water for 12 months. Came up covered in barnacles but once cleaned, as good as new.

I'd talk to seiko and explain what happened...

Write off.. sadly, and its not especially easy to get parts for the 8 series movement. Seiko build these in a monastery half way up Mount Fuji by blind master watchmaking monks who also make katanas for weebos. I just send my one back to Seiko as Ive mot found any independent who is prepared to tackle it

They found a Rolex sub covered in barnacles and rust in Australia that I don't think leaked. It was down for years and the guy was able to return it to the owner who lost it. This is an embarrassment for Seiko. I wonder if my Chinese Seiko homage MM running an NH35 would fare better? It might...

Poor mm

He only needs a new case, new dial, new crystal, new crown and new movement...

First time in my live that i see a Watch full of sea water opened and closed again without a general cleaning to eliminate rush and salt 🤦🏻‍♂️ you wasted time! It was clear that water was inside 🤷‍♂️ normally a trick is to leave the watch in a cup of rice 🍚 with unscrewed crown. Better if at 40-45 Celsius of temperature.

Just put in a new movement, it’s not rocket science 🤔