57 mm AZP S-60 is a Soviet towed, road-transportable, short- to medium-range, single-barrel anti-aircraft gun from the 1950s. The gun was extensively used in Warsaw Pact, Middle Eastern and South-East Asian countries.
Wikipedia https://en.wikipedia.org/wiki/AZP_S-60
Address (Unnamed Road), Нижний Новгород, Russia
Coordinates 56°19'40.053" N 44°2'6.406" E
