Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 763:
1923, Junk ½c black brown, the 2nd Peking printing, block of six (3×2) imperforated vertically, full OG with slight foxing, minor gum loss at left, otherwise NH, VF and very scarce, Chan #249d, Scott is not mentioned pair or strip imperf vertically, Est. $400-$500, Scott #248a var
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