Bundles of 100 copper mon coins strung jointly for convenience of the two transportation and payment. Mon coins ended up holed, allowing for them to generally be strung jointly with a bit of string. While in the Edo duration of Japan (1615-1868), stringed together coins acquired a little discount https://financefeeds.com/best-copyright-presales-to-buy-now-5-hottest-icos-on-the-market/