Lot 636
636
cover 1913, 50c Burgdorf Air Post semi-official (Michel IV), used with 5c Green (148) on special flight card to Signau, both tied by violet circular flight cachets, reverse is photo of the plane and pilot, very fine, Michel DM 1,500.00 photo
cover 1913, 50c Burgdorf Air Post semi-official (Michel IV), used with 5c Green (148) on special flight card to Signau, both tied by violet circular flight cachets, reverse is photo of the plane and pilot, very fine, Michel DM 1,500.00 photo

Details
cover 1913, 50c Burgdorf Air Post semi-official (Michel IV), used with 5c Green (148) on special flight card to Signau, both tied by violet circular flight cachets, reverse is photo of the plane and pilot, very fine, Michel DM 1,500.00 photo