Thailand. (Luxembourg). 1938. Envelope addressed to Luxembourg bearing Siam SG 164, 2s on 2a grey and deep violet (block of six) on reverse, SG 253, 3s green (reverse) and SG 255, 10s carmine tied by Bangkok/ 6 date stamp '23rd Feb 38' with Luxembourg Ville arrival '19th Mars' on reverse.
Lovely franking to Luxembourg and a scarce block on cover.