Then, on the advice of Oriental Bank of the U.K., 1 yen silver coins (called "silver trade dollar" later) were minted for convenience in addition to 1 yen gold coins as the standard money and the use of them only in the ports open to foreign countries was permitted without limitation.
そこでイギリス東洋銀行の助言により、本位貨幣である一円金貨とは別に便宜上、貿易用の一円銀貨（のち「貿易銀」と呼ばれる）を鋳造し、開港地に限り無制限通用を認めた。