203 mm/45 caliber Pattern 1892 gun
203 mm/45 caliber Pattern 1892 gun is a rifled breech loader or 8 inch naval gun.
Overview
Russian naval/coastal defence 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
“203 mm 45 caliber Pattern 1892”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q11849441: 203 mm/45 caliber Pattern 1892 gun
Consult the source