751898 Hong Kong SG 237 var. certleelee3:39 pmSeptember 21st, 2023 751898 Hong Kong SG 237 var. cert 0 Hong Kong SG 237 var. 1966 Queen Elizabeth II Inauguration of W.H.O. Headquarters, Geneva. 10c. Black printed double. Left marginal block of 4. Unmounted mint. With Cert. EXCEEDINGLY RARE & ATTRACTIVE.
