1986年中华人民共和国中国杰出历史人物精铸纪念银币5元:孙武、张衡、蔡伦、祖冲之,共四枚Peopl Republic of China, Proof Commemorative Silver Coin of the Prominent Historical Figures of China, 5 Yuan, 1986, Sima Qian, Zhang Heng, Cai Lun & Zu Chongzhi. SOLD AS IO RETURN. PCGS PR68 (3) & 67 (1) DCAM (4 pcs)