Thailand. (Siam Steam Navigation Company - Postmarks). Circa 1920. Siam SG 214, 5s carmine-pink cancelled by 'S.S. "BANKA" hand-stamp in violet, struck twice.
The 'S.S. "Banka" was built in 1919 for the 'Siam Steam Navigation Company'. 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 the mail. More vessels were added until the 'Siam Steam Navigation Co.' was founded in 1909. The steamers would carry mail from port to port in the ships mail bag. Loose letters were cancelled by the purser's fancy rubber hand-stamp and mail cancelled on board ship is very rare indeed.
A very rare Siam steamship cancel. The 'S.S. "Banka" was built in 1919 and sunk in 1940. Little information is known.
Not listed by John Garner in his article on the Siam Steam Navigation Company 1909 - 1940 in P.A.T. Journal March 2010.