Green’s Dictionary of Slang

sky-diver n.

[rhy. sl. = fiver n. (1)]

£5.

[UK]R. Puxley Cockney Rabbit.
[Ire]G. Coughlan Everyday Eng. and Sl. 🌐 Sky diver (n): a fiver (5 pounds).
[Scot]T. Black Gutted 254: I took out a skydiver, handed it over.