Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1148:
1918, violet overprint (type 1) on 1r brown, light brown and orange, side margin block of 14 and three-side margin block of 11 with 3 labels, a study made by Dr. Seichter, representing various overprint sub-types, minor creases and some foxing, full OG with many NH stamps, F/VF and interesting items for a specialist, Est. $200-$250, Bulat #210, var
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