Thanks Paul and Brad for your comments.
Brad: My Iskra followed the same route as yours!. I bought it as “faulty” from an US seller, send it to Oleg, and got it back a couple of weeks ago.
Regards
Joao
RF: Zork(1, 4), Fed(5, 2), Sokol (Automat, 2), Junost, Iskra, Kiev-4,
TLR: (2, 166Komsomolyets, Lubitel B), Flexaret
SLR: Zenit (3M, E, EM, ET, TTL, 12XP, 122K,19, Photosniper), Kiev-10, Olympus OM-2
Other: FED-50, Kiev35A, Smena (7, 8M), Estafeta