Thailand. (Siam Steam Navigation Company). Cira 1925. Envelope headed 'The East Asiatic Co. Ltd. Bangkok Branch' addressed to 'The East Asiatic Co. Ltd. Bandon' bearing Siam SG 211, 2s chocolate/ yellow (2) and SG 213, 3s red-brown (2) tied by ornamental "The Siam Steam Navigation Co. (with flag and anchor in center)' hand-stamp in violet.
The Company was formed as the 'Danish East Asiatic Company' in 1897. The Company had a steamer calling port to port from Bangkok down the Malay Peninsula with passengers, goods and had a contract to carry mail. More vessels were added until the 'Siam Steam Navigation Co.' was founded in 1909.
This fancy Steam Navigation cancel was used on the 'S.S. " Suddhadib" of the 'Siam Steam Navigation Company's fleet. The 'S.S. "Suddhadib" was built in 1918 and sunk during World War 2.
The steamers would carry mail from port to port in the mail bag. Loose letters were cancelled by the Purser's fancy rubber hand-stamp and mail cancelled on board ship is very rare indeed.