Vickers S
Vickers S is an autocannon or artillery model.
Also recorded as Vickers Class S; Class S.
Overview
40 mm autocannon aircraft armament.
In detail
Vickers S is an autocannon or artillery model.
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
“Vickers 40 mm Class S gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q2936462: Vickers S
Consult the source