Today I accidentally stumbled upon this beauty. Found it at my university, where it was left out for disposal. Cleaned it up and now it's looking stunning... Switches feel amazing, I would say they are like more superior Cherry MX blues, both sound and feel wise... Also might look into getting some different keycaps, as this one has German.
Congratulations—I mean
apsveicam! You have arrived at the peak of the keyboard mountain. Now you can relax, enjoy
real typing pleasure, look out over the wide landscape of inferior keyboard technology, and be gracious to those who aren't as lucky as you. :?)
It looks like you did a very nice job cleaning up your M. They were made so well, even when they've been used for decades, they can usually be cleaned up to look almost new.
Did you remove the top of the case and the keys, too, and clean out any debris from between the keys? As you may know, to open the case, you'll need a 5mm thin-walled hex-nut driver like this one:
You can usually get them online quite cheaply.
You'll also want a proper key pulling tool, which are usually included with new mechanical keyboards, or you can
order one online for only $1 or so. It's much better than trying to remove them with a screwdriver, or some other improper tool, which could easily damage them.
You didn't post a photo of your keeb's "birth certificate" (what we vintage keyboard people call the back label), but I'm guessing it's a p/n 1391403, the most commonly produced German/ISO Model M. Is that true? Feel free to show us the info anyway.
Also might look into getting some different keycaps, as this one has German.
Unicomp, who took over Lexmark's keyboard factory in the '90s, still makes many types of Model M key sets. They may be able to make an actual Latvian one for you. Since you got your board for free, you may think it's worth investing a bit of dough on something like that. Cheers!