1 Jokoh- Yongxing Jida

Bangka Island's tin coinage emerged directly from the island's dominant industry — by the late eighteenth century, Bangka was among the most productive tin-mining territories in Southeast Asia, with the Dutch VOC and later the Batavian Republic extracting enormous quantities of the metal. Striking coins from locally smelted tin was a practical consequence of that abundance, not a monetary innovation.

The Jida series were produced under Chinese mining kongsi administration, the labor syndicates that effectively ran Bangka's interior operations. "Jida" itself references these kongsi structures.