Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1396:
1918, black overprint (type 7) over 20k on 14k blue and carmine, full OG, VLH, VF and scarce, expertized by Prof. Seefeldner, the stamp is priced with ”-” in the Cat., Bulat #1492
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