Burma. (Air Mail). 1941. Air Mail envelope written from 'Burma Rifles, 13th Shan state Battalion, Taunggyi' addressed to the England bearing Burma SG 30, 1r blue and purple tied by Experimental/ R-1' double ring '25th July 41' endorsed 'via Durban' and endorsed 'Sept 15th (received) in m/s. Unusual use of this cancel, see Proud.