Bundles of a hundred copper mon coins strung with each other for convenience of both of those transportation and payment. Mon coins ended up holed, allowing for them for being strung jointly over a bit of string. In the Edo period of Japan (1615-1868), stringed alongside one another coins https://financefeeds.com/btcs-unveils-strategic-partnership-with-figment-and-wonderfi-leading-its-staker-protection-plan/