Archie--It's quite possible that they are a sort of "Tally-Ho" chips. I've had my Japanese friends in search of chips from Japan for years but with no luck. There aren't any open casinos (as we know them) in Japan. Many pachinko parlors, but that isn't even close. These could have been made for a private club or even an elaborate home game, which authorities tend to "look the other way" at.