I’ve wanted to see this in depth for awhile, thanks!

Mine has an all black three quarter plate and the pin block is exposed and really pretty. On top of the pin block there's another iron part that I assume must connect to the plate from the back but I haven't opened the panels on the back to check it out as I was eager to get it in my room and play it when I got it even though it doesn't hold a tune. Mine has 77 keys, strait strung with 2 strings per note and has a magical sound no modern piano can replace or even play the music I write for mine properly.

Good morning Brigham, I notice that the two cast iron plates belonging to the two Yamaha C7s have a different design, why?