1990年中国出土文物青铜器系列一。精製套币四枚。CHINA. Four Piece Proof Set, 1990. Bronze Age Discoveries Series 1. NGC PROOF-68 ULTRA CAMEO (1) & PROOF-69 ULTRA CAMEO (3).官方发行量5,000枚。全经NGC评鑑。Leopard是唯一得PF-68 Ultra Cameo,其他3枚均是PF-69 Ultra Cameo。附原盒及证书。新如出厂,无斑点、氧化或起雾。NGC PROOF-68 ULTRA CAMEO (1) & PROOF-69 ULTRA CAMEO (3).