The St Thomas weight was a unit of mass used in the British Presidency of Bombay , India . It was a measure in the gold and silver trade , but was often replaced by the English Troy weight. Then the weight was equivalent to 53 ¼ English Troy grains .
^ Christian Noback, Friedrich Eduard Noback: Complete paperback of the coin, measure and weight relationships. Volume 1, FA Brockhaus, Leipzig 1851, p. 45
↑ Christian Nelkenbrecher: JC Nelkenbrecher's General Pocket Book of Coin, Measure and Weight. Sanderschen Buchhandlung, Berlin 1828, p. 27