British invasion of Zeeland, letter (sender major Donald Gregorson of the 91st Regiment Foot) from Middelburg 19th November 1809 to Oban, at reverse handstamps FOREIGN NO 22 1809 (arrival at London) and No B 22 809, postage 2/6 (2 shilling, 6 pence), only 4 letters known to England, very fine, ex. coll. Muys