Gambar tin ingot currency ND

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The gambar is a formed rectangle of tin that is then folded, sometimes creating a sealed edge, sometimes leaving an open ‘canoe’ shaped gap. Between 1710 and 1825 the Sultanate of Palembang discovered and mined huge deposits of tin on Bangka Island. Tin was the common currency material on Sumatra and in the wider region. In addition to minting coins, one of the ways in which tin entered the currency market was through small ingots, weighing between 5g and 40g, which could then be put on strings and used in market places and turned into other forms of currency or used in manufacturing processes. These objects sit on the boundary between what Mitchiner calls ‘monetary’ items and ‘commercial’ items. Mitchiner argues that these ingots were means for getting tin into the marketplace during the surplus production period of the 18th century, but others (e.g. Quiggin) consider them to be a form of money. 

See:

Michael Mitchiner, ‘The circulation of tin in Palembang (Sumatra): Its monetary and non-monetary functions: Tin and lead ingots, animals and talismans’, Journal of the Oriental Numismatic Society 214 (2013), 25-33
A Hingston Quiggin, A Survey of Primitive Money (London, 1949), 251-257

Interesting fact