3 inch/23 caliber gun

3 inch/23 caliber gun is a rifled breech loader or naval artillery.

Overview

American naval/anti-aircraft 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
“3-inch/23-caliber gun”, English Wikipedia, consulted as further reading
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reference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q12052512: 3 inch/23 caliber gun
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