Bofors 57 mm Naval Automatic Gun L/60

Bofors 57 mm Naval Automatic Gun L/60 (Swedish: 57 mm sjöautomatkanon L/60 (57 mm SAK 60)), also known as 57 mm/60 (2.25") SAK Model 1950 and the like (full English product name: Bofors 57 mm Automatic A.A. Gun L/60 In Stabilized Twin Turret), was a twin-barreled 57 mm (2.2 in) caliber fully automatic dual purpose naval artillery piece designed by the Swedish arms manufacturer Bofors from the early 1940s to the early 1950s to meet a request from the Dutch Navy. Besides the Dutch Navy, the weapon was also adopted by the Swedish and the French Navy, most predominantly by the latter.

Source: Wikipedia — Bofors 57 mm Naval Automatic Gun L/60 (CC BY-SA 4.0)