Bundles of 100 copper mon coins strung together for advantage of the two transportation and payment. Mon coins were being holed, enabling them to get strung jointly with a bit of string. In the Edo period of Japan (1615-1868), stringed collectively coins gained a little price cut when introduced https://financefeeds.com/krakens-bid-for-deribit-still-on-the-table-as-copyright-shows-interest/