Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1158:
1918, blue gray overprint (type 1) on imperforated 3.50r maroon and green, right sheet margin single, full OG with slight gum wave, LH, VF and rare, expertized by Dr. Seichter, this stamp priced with ”-” in the Catalogue, Est. $150-$200, Bulat #46a
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