Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1406:
1918, black overprint (type 32) on perforated stamps of 2k, 3k and 15k, all with full OG, LH, expertized by J. Bulat, U.P.V. and Prof. Seefeldner, the stamp of 15k is priced with ”-” in the Cat, others have C.v. $6.25, Bulat #1860-61, 1864
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