Pin made in the Soviet Union. The text on the pin reads:”Serpukhov”. Serpukhov is a city in Moscow Oblast, Russia, located at the confluence of the Oka and the Nara Rivers, 99 kilometers (62 mi) south from Moscow. It has a population of 125 473 (2021). In modern times, Serpukhov has become a local industrial center with textile, mechanical engineering, furniture, and paper-producing industries.In WWII there were some fierce battles.