Leilão Bidspirit | 1951 (21 Nov) Meter franking

1951 (21 Nov) Meter franking cover carried by Deccan Airways Nagpur-Calcutta with ”SALVAGED NIGHT AIR MAIL DUM DUM CRASH 21st NOV 51” in violet. An attempt to land was made in extremely poor visibility conditions at Dum Dum Airport of Calcutta, the plane struck trees and crashed. 16 people were killed, part of the mail was Salvaged and forwarded after application of special cachet