That looks like a Soviet era Komandirskie in a 81 case. The ones with cccp at 6 o`clock were for civilian sale and the ones delivered to the military had 3 Cyrillic letters instead of cccp. Most amphibians were automatics and had a higher case back to make room for the rotor. Komandirskies were manual wind.
These watches are crude and rugged, but with poor accuracy. They had some interesting solutions to the problems Soviet had in the 60`s, mainly; how to produce a water resistant watch with sub standard machinery and technology. First the case back witch is in two parts, a Case back and a threaded ring to secure the case back against the case and a
tick gasket. Ensuring that as the water pressure rose the case back got pressed harder against the gasket. A simple and some what elegant solution. Second the "wobbly" crown that ensures that radial forces one the stem is minimised thus prolonging the life of it and the stem tube(?).
I have a Soviet Komandirskie from the late 90`s my self witch I used and abused for many years without any problems other than the chrome wore of on the back of the case. It always was ca 5 minutes slow per day!
As Walrus said these watches have a certain cool factor, others have called them charming. I shoved mine to some Chechen refugees, who did not think it was cool or charming at all. They clearly had no warm feelings for any thing Soviet or Russian, and they called my a god damned Russian spy. Tongue in cheek off course.
OP watch is, as others have said, worth fυck all. So buy the owner a beer and keep it as a curiosity. They can be had new for $63 from Meranom.
https://meranom.com/en/komandirskie-classic/81/
I think the European Vostoks are the same quality (or lack there of), but more expensive, but don`t take my word for it.
My Komandirskie with the flags of the Soviet army, navy and air force. I like the case back.