Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 333:
1917, two stamps with black overprint ”WAR” on 1c green, first one with reversed watermark Multiple Crown CA, the other one has double (one inverted) overprint, both with large part of OG, VF, SG#116ax, £300, stamp with double overprint is not listed in Gibbons, Scott #MR2 var
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