BL 14 inch/45 caliber gun
BL 14 inch/45 caliber gun is a rifled breech loader or coastal artillery weapon.
Also recorded as 14"/45 calibre gun; BL 14 inch gun Mk II.
Overview
American naval/coastal defence artillery.
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
“14-inch/45-caliber gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q2936480: BL 14 inch/45 caliber gun
Consult the source