Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1271:
1918, violet trident overprint (type 2g) on 1r brown, pale brown and orange, bottom sheet margin imperforate block of four, bottom stamps with inverted overprint, forming two vertical tete-beche pairs, slight gum waves, full OG, NH, VF, expertized by E. Kobylanski, Bulat#487, a
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