Green’s Dictionary of Slang

kone n.

[koniacker n.]

(UK Und.) counterfeit money.

[US]Matsell Vocabulum.
[Aus]C. Crowe Aus. Sl. Dict. 43: Kone, counterfeit money.
[Aus]Argus (Melbourne) 20 Sept. 6/4: Counterfeit [money] is sheen or kone or sinker or any other inexplicable and contemptuous term.