Since the Tenpo-tsuho only weighed five or six Kanei-tsuho coins and it was possible to produce a coin in 10 mon even less labor charge and reducing the weight by minting, the bakufu did not admit to issue the coin in local areas as 'Kinsei' (taboo), however some clans secretly minted the Tenpo-tsuho behind the imitative deception of the local coin issuance in the end of the Edo period.
天保通寳は寛永通寳5～6枚分の量目に過ぎず、吹き減りおよび工賃を差し引いても一枚10文前後のコストで製造可能である為、幕府は地方での発行を「禁制」として認めなかったが、幕末期に偽装工作としての地方貨幣発行の陰で各藩による密鋳が横行した。