12.7 cm/50 Type 3 gun
12.7 cm/50 Type 3 gun is a rifled breech loader or naval artillery.
Overview
Japanese naval artillery.
In detail
It is associated with Japan.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“12.7 cm/50 Type 3 naval gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4548054: 12.7 cm/50 Type 3 gun
Consult the source