No size tag but most likely 40R according to measurements.

This double breasted tux jacket is a work of understated elegance. It is black matte wool with black satin lapels and a patterned grey lining. The buttons are plastic, not satin, but look convincing. The label says Hardy Amies/ Roger Kent, which dates it to probably the 50s. Inside an inner pocket is a Lord West label, a union label, and a signature in blue ink. Measures: Chest 40" Length 30" Sleeve length 24" Shoulder Width 18"