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It's likely that they picked a size that fit within the entire vending space-- not arcades specifically.

The mechanisms on old games-- like other vending machines-- could be configured with gates to accept different size coins, but they probably topped out at a maximum size smaller than the Eisenhower. So a machine with a big enough opening to take, say, a UK 10p would be able to accept a SBA if you snapped the right gate over it.

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