Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1416:
1918, black overprint (type 45) on perforated 1k and 4k, imperforate 3k (inverted) and 5k, full OG, NH (1) or LH, VF, expertized by J. Bulat and others, the stamp of 3k with inverted overprint is priced with ”-” in the Cat., all others have C.v. $140, Bulat #2018, 2020, 2027a-28
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