连原盒及证书 #2565。1) 港沪通航10克银章。 NGC PROOF-68 Ultra Cameo.2) 港杭通航10克银章。 NGC PROOF-67 Ultra Cameo。(t) CHINA. Set of Navigation 10 Gram Silver Medals (2 Pieces), 1980. Both NGC Certified.Includes box and COA #2565.1) Navigation Between Hong Kong and Shanghai 10 Gram Silver Medal. NGC PROOF-68 Ultra Cameo.2) Navigation Between Hong Kong and Hangzhou 10 Gram Silver Medal. NGC PROOF-67 Ultra Cameo.