In addition, another example was Hakodate Tsuho, and the minting of this coin was approved when the port of Hakodate was about to open to the United States based on the Treaty of Peace and Amity between the United States of America and the Empire of Japan agreed in November in 1856.
これを始め安政3年（1856年）11月に日米和親条約に伴う開港を機に発行の許可を取り付けた箱館通宝が存在した。