Oerlikon FF
Oerlikon FF is an autocannon or artillery model.
Overview
Swiss autocannon.
In detail
It is associated with Switzerland.
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
“Oerlikon FF”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q281890: Oerlikon FF
Consult the source