5"/38 caliber gun
5"/38 caliber gun is an artillery gun or artillery model.
Also recorded as Mark 12 5"/38 caliber gun; Mk12.
Overview
United States naval gun.
In detail
It is associated with United States.
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
“5-inch/38-caliber gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q2071130: 5"/38 caliber gun
Consult the source