I think these are genuine but don't have a clue about cash coins. The one on the left is brass and 20mm dia, the left looks to be copper and 22mm. Any idea what these are?
Your first coin appears to be from the Ching Dynasty, Emperor: Hsuan Tsung (1821-1850) Reign Title: Tao Kuang (1821-1850). Board of Revenue mint. The second coin appears to be Japanese rather than Chinese although it is too worn to be sure. These links will give you more information on both coins:-
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