Thailand. (Siam Steam Navigation - Postmarks). 1910. SG 143, 6s carmine (pair) cancelled by double ring oval 'S.S. 'Yugala" with additional Bamboo chop.
The 'S.S.S "Yugala" (753 tones) was built in 1907 for the 'Siam Steam Ship Company'. The Company was formed as the 'Danish East Asiatic Company' in 1897. The Company had steamers 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.
Stamps cancelled with the 'S.S.N. CO' hand-stamps can sometimes be found additionally obliterated with a circular Bamboo chop. These Bamboo cancellations appear to have been applied at the Post Office of arrival where the Purser's hand-stamp was regarded as insufficient.
The 'S.S. "Yugala" sank due to a serious fire on board 9 May 1923.