The bakufu insisted that the four-mon iron coin was a four-mon refined-iron coin which was especially made of refined iron ingots, but only a small quantity was issued because of bad reputation and loss caused by the minting of coin.
幕府は特に精錬した鉄地金を用いた精鉄四文銭（せいてつよんもんせん）であることを強調したが、評判は悪く、鋳銭に関して損失が出るなどしたため発行は少数にとどまった。