BL 7.5 inch Mk VI gun
BL 7.5 inch Mk VI gun is a rifled breech loader or naval artillery.
Overview
British naval/coastal defence artillery.
In detail
It is associated with United Kingdom of Great Britain and Ireland.
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
“BL 7.5-inch Mk VI naval gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4835908: BL 7.5 inch Mk VI gun
Consult the source