10 oz

The Type 10 or 12 cm/45 10th Year Type naval gun was a Japanese 120 mm calibre dual purpose anti-aircraft and coastal defense gun used during the Second World War. It was derived from the 12 cm/45 3rd Year Type naval gun. The Type 10 number was designated for the year the gun was accepted, the 10th year of Emperor Taishō's reign, 1927 in the Gregorian calendar.
It served as the secondary armament on a number of Japanese aircraft carriers and cruisers and as the main armament on smaller ships, in single or twin mountings.
Despite mediocre traverse and muzzle velocity, the 12cm Type (Taisho) 10 was widely used throughout the Pacific since it was relatively simple to produce, threw a powerful shell, and did not require external power (making it easier to emplace at remote sites). By the end of the war 40% of the naval AA units in homeland Japan were equipped with this weapon as well.

View More On Wikipedia.org