Green’s Dictionary of Slang

1. (US Und.) an eye.

1935		A.J. Pollock Und. Speaks 3/1: Apple pies, eyes.
1944		Maurer & Baker ‘“Aus.” Rhyming Argot’ in AS XIX:3.

2. the sky.

1960		J. Franklyn Dict. Rhy. Sl.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1984		Partridge DSUE (8th edn) 23/2: since ca. 1940.
1992		R. Puxley Cockney Rabbit.
2001		M. Coles Bible in Cockney 24: There will be more of them than there are bloomin’ stars in the apple. [Ibid.] 52: They all had their mince pies on the apple pie as ’e went up to heaven.