Zastava M55
Zastava M55 is an anti-aircraft gun or artillery model.
Overview
Type of towed 20 mm anti-aircraft triple autocannon.
In detail
It is associated with Yugoslavia.
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
“Zastava M55”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1590666: Zastava M55
Consult the source