Green’s Dictionary of Slang

(US) California.

1930		G. Milburn Hobo’s Hornbook 35: There was Hijack Hix and Pa Tricks, [...] The Cally Speed Ball and Doc Hall.
1960		(con. 1950-1960) R.A. Freeman Dict. Inmate Sl. (Walla Walla, WA) 23: Cally – California.