Switzerland 1949 (27. 4. ), pro aero flight Chaux-de-Fonds - St. Gallen - New York on correctly franked registered cover. It is a matter of a the few well-known covers on this Swissair first flight. Certificate Ruos Dealer Jean-Paul Bach Auction Minimum Bid: 500.00 CHF (via Philasearch.com: Bach 9th Mail Sale Auction - item 9208-A9-1663)
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