Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1198:
1918, violet overprint on perforate 20k blue and carmine, a part of postal cancellation and pinholes to prevent repeated usage, still nice quality, VF and rare, the stamp priced with ”-” in the Catalog, Est. $150-$200, Bulat #2308
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