Lot 51217 – 1933 special flight cover Dacca to Calcutta March franked with 3p 1a, with red cachet “1st Experimental Flight

1933 special flight cover Dacca to Calcutta March franked with 3p 1a, with red cachet “1st Experimental Flight Dacca Dum Dum”, an accompanying note remarks that this was possibly a survey flight by Prince Ali Khan in preparation for Indian Noational Airways Calcutta-Dacca service that operated from 1 Dec; a scarce experimental flight with 53 carried.