C'est bien initialement un calibre Poljot, qui est passé de mains en mains .J'avais recopié ça sur un site que je n'arrive plus à retrouver :
One of the slim movements caliber 2209 "Vympel" (Pennon). Its thickness is about 2,9 mm, central seconds, shock protecting system, 23 jewels
In 1963, during an international Fair in Leipzig, the “Vympel” watch was awarded with a Diploma and a Gold medal. These watches were on production from 1961 until 1975, later the technology was passed to Minsk Watch Factory and produced there till 1979. This one is made by Belarus Luch plant (Luch means a Ray). All bridges are brushed and bevelled, all screws are polished. As to hairspring - it's flat. Pay attention to the case. It was common to plate 20 microns of gold.
Ed