Air Mail cover 1912 (March) Bork-Brück Second Flight, (-) IMPERFORATE PROOF IN BLACK AFFIXED TO 1912 (18 MARCH) FLIGHT CARD, cancelled by "FLUGBEFÖRDERUNG/BORK-BRÜCK/DURCH/GRADEFLIEGER" cachet in black, put into the mail at Brück (23.3) and bearing regular 5pf.; the picture side of the postcard showing "Erste deutsche Flugbeförderung von Bork nach Brück" cachet in red. One of the few examples of the second Bork-Brück Flight proof used on flown mail. Signed Grabowski. M. 2B, DM.25,000. Photo
Air Mail cover 1912 (March) Bork-Brück Second Flight, (-) IMPERFORATE PROOF IN BLACK AFFIXED TO 1912 (18 MARCH) FLIGHT CARD, cancelled by "FLUGBEFÖRDERUNG/BORK-BRÜCK/DURCH/GRADEFLIEGER" cachet in black, put into the mail at Brück (23.3) and bearing regular 5pf.; the picture side of the postcard showing "Erste deutsche Flugbeförderung von Bork nach Brück" cachet in red. One of the few examples of the second Bork-Brück Flight proof used on flown mail. Signed Grabowski. M. 2B, DM.25,000. Photo
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