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Auction: 154 - The Philatelic Collector's Series Sale
Lot: 348

#649, 2c Aeronautics Conference, gem mint example in the finest obtainable quality, perfectly centered within large equal margins, o.g., n.h., a superb gem; 2014 PSE certificate (Gem 100, one of only five examples to achieve this lofty grade; SMQ $300.00).

Sold for
$270