Green’s Dictionary of Slang

dee n.1

[orig. Rom.]

a purse, a pocket-book (cf. die n.2 ).

[UK]H. Brandon Dict. of the Flash or Cant Lang. 162/2: Dee – a pocket-book.
[UK]G.W.M. Reynolds Mysteries of London III 85/1: Three wedge-feeders, a yack, and a dee .
[UK]Hotten Dict. of Modern Sl. etc.
[UK]Sl. Dict.
[Aus]Sydney Sl. Dict. (2 edn) 3: Dee - A pocket-book.