What I think I know ....
For the last couple of years, off and on, I have been trying to pin down reliable information on the history of production of the 3602/3 watch movement by USSR/Russia.
So far I am reasonably confident that the design (and probably the tooling) was purchased from Swiss firm Cortebert immediately after the end of the Great Patriotic War - as USSR sought to jump start its industries after the devastation of the war.
The production of wrist watch movements received a similar 'jump start' with the help of French company LIP.
The manufacture of pocket watches was initially from two sites, Moscow Watch Factory 2 and the newly completed (1947) factory in Chelyabinsk. The movements were 15 jewel and finished to a high standard. The bulk of production was for the Soviet Defence Forces.
My main source of data has been eBay listings. The earliest date I have found so far for 2nd Moscow Watch factory movements is third quarter 1948 (3-48) and for Chelyabinsk first quarter 1951 (1-51). The cases are 43mm in diameter and slim, 12mm.
The latest date for 2nd MWF is from a 17 jewel movement manufactured third quarter 1956 (3-56) and from Chelyabinsk fourth quarter 1965 (4-65) from a 15 jewel movement !!!
In 1964 the Chelyabinsk logo changed from ЧЧЗ to a stylised clock face with hands at 'ten to two'. The new logo is almost completely obscured by the balance/balance cock. The date stamping on movements seems to have ceased at the same time.
What I would like to know ...
When was the design updated from 15 to 17/18 jewels?
When was the larger 50mm / 15mm open face case introduced ?
When were the commemorative Hunter cases introduced ?
I have to accept that the data I have been collecting may be 'tainted' by the ingenious and resourceful Ukranian watchmenders who happily combine parts from several watches to make 'a runner'.