Falkland Is SG142a 1935 Silver Jubilee 1/- Extra Flagstaff on Cover

1935 (6 Nov.) envelope from Port Stanley to England bearing full set 1/- showing variety extra flagstaff each cancelled by despatch c.d.s. Envelope with some light ageing nevertheless a very rare variety on cover. S.G. 142a (2500 pounds as a used stamp). Spink March 1998. One of only just 94 possible from the august 1935 third printing.