Green’s Dictionary of Slang

1. (boxing) the face.

1858

A. Mayhew Paved with Gold 191: Before this round was completed, Jack took a heavy instalment on his ‘turret,’ which must have damaged his ‘weathercock.’.

2. (Aus.) the head.

1910		Bulletin (Sydney) 7 July 14/1: Sodden ’n’ sorry ’n’ boomin’ in th’ turret I wuz bounced to the booby hatch.
1914		Ade ‘The New Fable of the Scoffer who Fell Hard’ in Ade’s Fables 246: He sallied forth with those going to Early Mass, and returned at the Vesper Hour caked with Dust and 98 per cent. gone in the Turret.