buncal

A unit of mass used for bullion and specie in the East Indies, at least as early as 18^th century – 20^th century. Also spelled bonkal.

In Malacca, about 30.5 grams. Blockhuys (1924), however, reports it at 53.9 grams. The same source lists the Singapore buncal at 54.09 g and the Penang buncal at 54.12 g.

In the Dutch East Indies, about 46.5 grams.

E. J. Blockhuys.
Vade-Mecum of Modern Metrical Units for Business Men and Students of Commerce. 17th edition.
Tokyo: Dobunkwan, 1924.

sources

At Acheen the Buncal, of one ounce, ten pennyweights and twenty one grains [47.4 grams], is the standard.

William Marsden.
The History of Sumatra… Second Edition.
London: Printed for the author, 1784.
Page 136.