I found an IBM battleship (aka the Model F122) at an estate sale, so I guess now I'm some kind of mechanical keyboard royalty. Model M peasants are allowed to kneel. They also had a bunch of vintage computers (I recognised a C64, the PC XT, and a PS/2, there were also some PC-compatibles) and video games, but I'm not into that scene so I didn't get anything. They didn't have any CRTs anyway, and a vintage computer without a nice amber CRT isn't worth bothering with. Bit sad about that, I would have loved to try installing Xenix on a computer with an amber CRT, that's just such a great aesthetic.
It's already been converted to USB so I've been able to test it, everything seems to work fine except for a bunch of missing key caps. It also desperately needs a new layer of paint. I can definitely see why people like these, it's really nice to type on. I ordered a new foam insert and lots of springs+flippers anyway since I'm pretty sure the exposed ones are not in great condition, as well as an entire new set of Russian key caps (for Model M, but they should still work on this). I'll probably take it to a mechanic to get sand blasted and powdercoated, it does look really decrepit. Probably not going to use it even though it's definitely the nicest-feeling keyboard I've ever used, it's just way too big, but I think it will still look nice on display in my office bookshelf once I fix it up a bit.