From the book “Watch” history of the modern wrist watch by Pieter Doensen. Yanka quartz caliber 3050, also known under the names ‘Slava’, ‘Luch’ or ‘Ruhm’. The first Russian quartz watch, caliber 3050, that was brought on the market around 1980 with a tuning fork shaped quartz of 9,720 hz. The watch was equipped with a stepping motor and a hybrid circuit, mounted on a plate made out of pertinax.
Your watch looks almost identical to the one in the book with the exception of the integrated circuit which is made of black plastic.