Obukhovskii 12 inch/52 Pattern 1907 gun
Obukhovskii 12 inch/52 Pattern 1907 gun is a rifled breech loader or naval artillery.
Overview
Russian naval artillery.
In detail
It is associated with Russian Empire.
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
“Obukhovskii 12-inch/52-caliber Pattern 1907 gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1131113: Obukhovskii 12 inch/52 Pattern 1907 gun
Consult the source