Green’s Dictionary of Slang

(Ling. Fr./Polari) money.

1962		R. Hauser Homosexual Society Appendix 3, 167: Measures, money.
1972		B. Rodgers Queens’ Vernacular 137: Money in general: [...] measures (Brit gay sl, fr Parlyaree medzer = halfpenny // It mezzo = a half).
2019		P. Baker Fabulosa 294/2: measures, medzers, metzers,metzes, mezsh money .