203 mm 50 caliber Pattern 1905
203 mm 50 caliber Pattern 1905 is a naval artillery or coastal artillery weapon.
Overview
Type of naval gun/coastal artillery/railway artillery.
In detail
It is associated with Russia.
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 50 caliber Pattern 1905”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q16271647: 203 mm 50 caliber Pattern 1905
Consult the source