Third year type 20 cm/50 caliber guns (五十口径三年式二〇糎砲, gojūkōkei sannenshiki ni-maru centi-hō) formed the main battery of Japan's World War II heavy cruisers
The 12.7cm/50Type3navalgun was a medium-caliber navalgun of the Imperial Japanese Navy used during World War II. It was the standard weapon for Japanese