Precision

A very rare movement - precision Vostok. You can meet gold plated as well as nickel plated. All production was under the strict control, only a small part of movements could be called a precise watch. Others (which hadn't passed thru the special tests are known as cheaper Almaz watches. I've read enough about watch tests in USSR - very common with COSC certification. There were some differences - 10 days of testing instead of 15, other temperatures of testing: 00?, +200? and +400?.
Features: microregulator on the balance cock, not central friction, big balance
Source: www.horology.ru/articles/tz2.htm