it is russian, this a a 40 yr old one but the newer ones look similar, the first Fiddy reps came with these and you can still get some vintage pam reps from DSN with them but the movement on its own can be ripped from any cheep russian pocket watch
have a look on the bay search molnija
screwed balance on this one here
This one from DSN had one in it, not sure if it was a screwed balance though, as the photo are gone. The newer versions had 19 j and the older ones were 17j.