Welcome to the forum, bioforce!
Sorry to disappoint you, but your coins appear to be Chinese cash coins.
The reverse of a Japanese mon would have just lines, like this

Chinese coins bear Manchu script identification of the mint.
The first coin is struck for Hsuan Tsung, 1821 - 1851, by the board of revenue in Peking.
I'd like to see better pics of the other two to correctly ID them.
Sorry to disappoint you, but your coins appear to be Chinese cash coins.
The reverse of a Japanese mon would have just lines, like this

Chinese coins bear Manchu script identification of the mint.
The first coin is struck for Hsuan Tsung, 1821 - 1851, by the board of revenue in Peking.
I'd like to see better pics of the other two to correctly ID them.

























