Italian 120 millimetre naval guns were standard main armament on Italian destroyers. The Leone class had the M1918/19 Pattern, but this was superseded by the O.T.O. 1926 Pattern for the Sella, Sauro and Turbine classes. The Navigatori class introduced the improved 50 calibre Ansaldo 1926 Pattern.
The original article can be found at 120 mm Italian naval gun and the edit history here.