BL 4 inch Mk VII gun
BL 4 inch Mk VII gun is a naval artillery or rifled breech loader.
Overview
1908 British naval 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 4-inch Mk VII naval gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4835895: BL 4 inch Mk VII gun
Consult the source