Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 679:
1919, inverted black framed ”Z” overprint (size 14mm) on 35k red brown and green, transition block of six (3×2) with frame printed partly to varying degrees, full OG, NH or hinged (one stamp), VF, Artar #59g var, Est. $200-$250,Scott #41 var
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