Macao Stamp 1939 Macau 50 avo Imperio Colonial Portugues Airmail stamp, overprinted for 1940 New York World Fair, Unmounted Mint with expert mark on reverse, Scott No. C13var, Yang U2, with Intl Society for Portuguese Philately certificate
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Macao Stamp 1939 Macau 50 avo Imperio Colonial Portugues Airmail stamp, overprinted for 1940 New York World Fair, Unmounted Mint with expert mark on reverse, Scott No. C13var, Yang U2, with Intl Society for Portuguese Philately certificate