This is a Russian / Soviet Union, Order of the Patriotic War in silver (second class).
The Order of the Patriotic War (Russian: Орден Отечественной войны) is a Soviet military decoration that was awarded to all soldiers in the Soviet armed forces, security troops, and to partisans for heroic deeds during the German-Soviet War (Second World War), known by the former-Soviet Union as the Great Patriotic War.
These stars were awared to former soldiers long after World War 2, until the 1980’s even. This one is (obviously) a postwar medals as can be seen by the high number:
In very good condition and complete with screwplate.