Poland
People's Republic of Poland (1952-1989)
Av: Classicist frame, bottom 1978, 50 YEARS / GABINETU / NUMIZMA / TYCZNEGO / MENNICA / WARSAW / SKIEJ, Rw: Classicist frame, top 1928, center concave mw and convex GN, designed w made by Jerzy Jarnuszkiewicz
silver-plated and oxidized tombac, 59.6 x 59.9 mm, 174.34 g, mintage 300 pieces, medal in frame rotated 360 degrees