Description
Soviet Union (1961 - 1991), Commemorative coins
Composition: Copper-Zinc-Nickel
Edge type: Lettered ('ОДИН РУБЛЬ • ОДИН РУБЛЬ •' (One ruble one ruble))
Alignment: Medal (0°)
Weight: 12.8 g
Diameter: 31 mm
Thickness: 2.3 mm
Stamping period: 1981
Obverse: 1 РУБЛЬ / СССР
Reverse: 1981 / ДРУЖБА НАВЕКИ
Soviet-Bulgarian friendship