Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1497:
1918, inverted black overprint (type 2) on imperforated 3.50r maroon and green in block of four, both left stamps without overprint, full OG, NH or LH (top stamps), VF, expertized by Dr. Seichter, Bulat #739g var, C.v. $120 as two pairs with and without upright overprint, Est. $100-$150
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