2 Answers

It's a token for a (Japanese) Pachislo slot machine.  There are a few people selling them on ebay. One person is selling 500 coins for $24.93.   I have not found much information on them, but according to what I've read, there are so many of them, they are practically worthless.

 Pachislo slot machines take tokens rather than coins, and are only used for a couple of years before they are sold to casinos elsewhere in the world (and sometimes to private owners; you occasionally find these in homes as collectibles).  http://www.casino-sites.co/online-casino-slot-machines/what-is-a-pachislo-slot-machine

https://forums.arcade-museum.com/showthread.php?t=268833&page=3

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