Thailand. 1937. Advertising envelope addressed to Belgium headed 'A. Elion & Nahmias, General Exporters, Bangkok, Siam' bearing SG 258, 2s brown, SG 239, 5s green, SG 240 , 10s orange and black, SG 252, 2s chocolate (2) and SG 253, 3s green, tied by Bangkok date stamp. Attractive item.