Oblate holed coin: need help identifying

This piece measures about 49 x 32 mm.
It was in a large accumulation of U.S. and world coins.
Can anyone help me identify it? Is it a coin? A medal? Good-luck charm? Tourist-trap souvenir?
It was in a large accumulation of U.S. and world coins.
Can anyone help me identify it? Is it a coin? A medal? Good-luck charm? Tourist-trap souvenir?

0
Comments
At least that's what my 1993 Krause says.
My wantlist & references
<< <i>It's a Japanese 100 mon coin, made between 1835-1870. C#7.
At least that's what my 1993 Krause says.
The same attribution appears in all editions of the Japanese Numismatic Dealers Assn. annual catalog, and just about all relevant English language references:
Later editions of the 19th Century KrauseModern World Coins by YoemanJapanese Coinage by Jacobs & VermueleModern Japanese Coinage by CummingsCoins of Japan by Muinro, andCoins of the World by Craig
I strongly suspect that they are right.I appreciate the help.