15.5 cm/60 3rd Year Type naval gun Tags: Weapon.The 15.5 cm/60 3rd Year Type gun (60口径三年式15.5cm3連装砲 60 kōkei sannenshiki 15.5 centi rensōhō) was a naval gun used by the Imperial Japanese Navy on the Yamato-class battleships the Mogami-class cruisers (as completed) and on the light cruiser Ōyodo. thumbnail used in war World War II Learn more... Loading...