Bundles of a hundred copper mon coins strung with each other for benefit of the two transportation and payment. Mon coins were being holed, letting them to be strung with each other over a bit of string. Within the Edo period of Japan (1615-1868), stringed with each other coins https://financefeeds.com/doge-price-tipped-to-correct-top-analyst-explains-why-panshibi-shibi-asian-backed-meme-is-key-to-big-gains-this-year/