KM# 21 20 MARKemblem, denomination Rev: Crowned snake with ring and wings,20.9000 g., 0.8000 Silver 0.5375 oz. ASW, 33 mm. Subject:wings divide dates above Edge Lettering: 20 MARK (repeated)150th Anniversary – Birth of Karl Marx Obv: State emblem, Germany DDR 1972 1968