Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 813:
1881, Quetzal, 2c brown and green, center inverted, block of four, full OG, previously hinged, VF and very rare, according to enclosed S. Sismondo certificate only 4 blocks of this stamp survived, C.v. $2,900++,Scott #22a
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