Poland
People's Republic of Poland (1952-1989)
Av: Warsaw Mermaid, behind her walking children, rw: VII WIEKÓW / WARSAW, designed by Wanda and Józef Gosławski
silver-plated and oxidized tombac, 63.2 x 64.0 mm, 118.55 g, mintage 500 pieces, worn silver plating, bump at edge