Bought yet another challenge; two Kiev 19 bodies. The other one is from 1992 and was sold as parts, the light meter does not work - otherwise seems that it has not seen much use - maybe none. The other one is 1986 and has been used and even tested, but the 1/500 was just the same as 1/250. So something wrong in that too.
I think the older one could be better candidate, since it's made before USSR collapse + it has actually been used. But I have to fix the speeds and the bent light baffle (looks like someone had mangled it)
There's a manual for this @ learncamerarepair
https://learncamerarepair.com/product.php?product=783&category=2&secondary=24
Started dismantling the 1992 one. So far, seems quite "normal", it's modular - you can remove the lens mount unit after peeling the leathers and zero springs and washers fly at your face. The electronics can be screwed off and lifted off with the mirror box - as one unit (and no surprise springs and bent levers at your face either!)
I hear that the problem with these is poor material quality. It may well be - this looks a bit like Praktica MTL but with more coarse parts. So yet another "principle" camera from the east, it's OK if the fabrication has gone ok..