Green’s Dictionary of Slang

gent n.3

[abbr. Ital. argento, silver]

(Ling. Fr./Polari) money, usu. silver.

[UK]Hotten Dict. of Modern Sl. etc.
[UK]Sl. Dict.
[UK]Barrère & Leland Dict. of Sl., Jargon and Cant.
[UK]P.H. Emerson Signor Lippo 28: They were Stock Exchange cards, so we knew there would be plenty of gent.
[UK]H. Young Lex. of Polari [Internet] gent money.