Gambia SG144b 1935 Silver Jubilee 3d Short Extra Flagstaff on Cover

1935 (27 Dec.) envelope air mail from Bathurst to Scotland bearing 3d. block of four the lower left stamp showing variety short extra flagstaff neatly cancelled by despatch c.d.s. the reverse with additional 1922-29 1d. and showing AIR MAIL/ GAMBIA-ENGLAND cachet in violet fine and attractive. S.G. 144b (cat 325 pounds as a used stamp). Grosvenor November 2007