Burma. (Travelling Post Office). 1941. Burma postal stationery card 'one anna' brown upgraded with SG 19, 3p bright violet (pair) and SG 20, 6p blue tied by 'R-33/OUT/Set-2' double ring '4th Aug 41' addressed to India with Kalaw transit on reverse. Rare Travelling Post Office Thazi to Heho railway line. Superb use of the R-33 OUT.