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Auction: 140 - July Philatelic Collector's Series Sale
Lot: 459

Air post cover group of about 80, several franked with #C1-6, including #C2 used on July 15, 1918 first flight and another on an early Sept. 14, 1918 flight, nine with #C3, also blocks of four of #C4-6 on flight covers, two each #C13 and C14 on separate covers/cards, nine flown covers with #C18 including two with blocks of four, plus later flight covers including Zeppelins, majority is fine-very fine.

Sold for
$2,600