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Auction: 177 - The Philatelic Collector's Series Sale
Lot: 435

Switzerland
1913, Burgdorf-Bern semi-official airmail,
on Nationale-Flugspende event postcard, used in combination with 5c William Tell, postmarked with violet flight c.d.s. (30 March), small stain to semi-official and hinge marks to card from prior mounting, else a fine and scarce card. (Zumstein IV, CAT CHF1,200)
Cover

Estimate
$200 to $300

Starting price
$120