Japanese Coin - probably 19th Century 1 Mon - need help deciphering text [solved]

Hello, I've been trying to identify this coin. Narrowed possibilities to Japan 19th Century, maybe a 1 Mon?
Any information or confirmation welcomed.

Round with squared hole on centre
Metal: bronze or copper (or non-ferrous brown alloy!)
Diameter: 28mm
Edge: smooth (thickness 1mm)
Weight: 4-5g

Hello and welcome to Numista!

I have this coin (with some damage) and it is actually my avatar.

Chinese Cash 1657-1661
https://en.numista.com/catalogue/pieces41716.html
Your picture on the left is upside down.

Thank you!