Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 760:
1942, Dr. Sun Yat-sen, $50 blue, block of four imperforated horizontally and rouletted (6½) vertically, no gum as issued, VF, Chan #617b, SG #661a, £480 as singles, Est. $250-$300, Sc. # 511 var
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