piaster, n. — Green’s Dictionary of Slang

piaster n.

also piastre

[SE piastre, piaster, used for a small-denomination coin in various currencies]

(US) a dollar.

1907		B. Fisher A. Mutt in Blackbeard Compilation (1977) 16: Old Mutt slipped a couple over on the books yesterday, swelling the assets just 407 piasters.
1963		A.S. Fleischman Venetian Blonde (2006) 162: It didn’t make sense that Rinny Jim would part from a lusty package like Maggie – and a million piastres.