Bundles of a hundred copper mon coins strung together for ease of equally transportation and payment. Mon coins ended up holed, allowing them to be strung together on a bit of string. In the Edo duration of Japan (1615-1868), stringed together coins received a little lower price when introduced https://financefeeds.com/asic-bans-jb-markets-peter-aardoom-from-financial-services-for-eight-years/