Thailand. (Canada - A.V. 2 Mail). 1948. Air Mail envelope written from the 'Bank of Siam' addressed to Canada bearing SG 254, 5s violet, SG 262, 3b green and black (strip of five), SG 307, 1b indigo (strip of three and single) and SG 315, 20s purple - brown tied by Bangkok GPO date stamp endorsed 'By Air Mail' and hand-stamped 'A.V. 2' on face.
Rate of 19 baht and 25 satang for 25 grams. Very rare franking.