Green’s Dictionary of Slang

Henry Halls n.

[rhy. sl. = balls n. (1); ult. popular UK bandleader Henry Hall (1898–1989)]

the testicles.

1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1995		J. Cameron Vinnie Got Blown Away 130: Funny muggers went straight for his Henry Halls.