2 Cash - Kaiyuan Tongbao, Tin imitation

The Kaiyuan Tongbao prototype dates to Tang Dynasty China, first cast in 621 AD, and its design circulated so persistently across maritime trade networks that local tin copies were still being produced in Southeast Asia nearly eleven centuries later. These imitations were not forgeries in any meaningful legal sense — there was no single authority to defraud. They filled genuine small-denomination gaps in port economies where Chinese cash coins were trusted currency but chronically undersupplied.

Tin was the obvious material choice across the Malay Peninsula and Sumatra, where it was mined in abundance. The weight and alloy vary considerably across examples, reflecting purely local production with no standardizing mint behind them.