um... Australian ones?

[edible_hat]

Are you in Sydney EH?

Nope, the enlarged country town known as Adelaide.

[SpyOne]

that and the US does have four different dollar coins still in circulation.

Eisenhower dollar (1971–1978)
Anthony dollar (1979–1981; 1999)
Sacagawea dollar (2000–Present)
Presidential Dollar Coin Program (2007–2016?)

For those unfamiliar with US coins, any machine that can take any of the last 3 will take them all: they are exactly the same size. The Susan B. Anthony dollar is silver in color, while the Sacagawea and President versions are gold in color (I've read it is a molebdinum alloy), and differ only in their artwork.
The Eisenhower Dollar is a throwing weapon: it weighs about an ounce (28-30 grams), and is a couple of inches in diameter, and I don't think there has ever been a machine made that accepts them (although slot machines might have been made).