Green’s Dictionary of Slang

(US) a $10 note.

1948		Manone & Vandervoort Trumpet on the Wing 92: I stashed away those five Hamiltons.
1986		R. Campbell In La-La Land We Trust (1999) 1: Having counted ten Hamiltons out of the corner of her eyes, and knowing what good times they would buy.
1997		Simon & Burns Corner (1998) 111: Gary’s hand, the one with the death grip round Hamilton’s throat, is coming alive, pulling itself out of his pocket.
2000		G. Pelecanos Shame the Devil 130: I’ll bet you a hamilton he asks about my game, like he always does.
2004		E. Weiner Drop Dead, My Lovely (2005) 127: I pulled out my wallet. ‘Why don’t you have this discussion with Mr. Hamilton.’.
2013		K. Shea ‘Having Chiqui’ in ThugLit July-Aug. [ebook] [P]eeling out Hamiltons to the talent.