The case in this watch is similar to #23 a contemporary watch that also has this ambiguity regarding its origins (russia, urss). This characteristic is not unusual in pieces of this time period.
It has a 21 jewels 2416 automatic movement with date.
The back is inscribed with a phrase pronounced by Peter the Great in 1716: "There is a great need of engineers"
Other translitarations: Wostok
Original name in Cyrillic: ВОСТОК

The inscribed back:

Some pictures on my wrist:
With a friendly cat at Miramare's park on Trieste (Italy).

