Poland
People's Republic of Poland (1952-1989) - Warsaw Mint
Av: In the center the number 20 whose 0 looks like a bearing, surrounded by a wreath, around it in Russian an inscription, Rw: In a circle OСПП, around it coats of arms of the Comecon countries
Silver plated tombak, 59.6 mm, 94.34 g, mintage 250 pieces