Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1156:
1918-21(c), 10k dark blue, litho printing on paper without varnish lines, size 15.2×21 instead of 15.5×21.7mm for issued stamps, horizontal imperforated pair, full ”original gum”, VF and rare, a common stamp is included for comparison, Est. $500-$600, Sc. # 124
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