2 cm KwK 30
2 cm KwK 30 is a 20 mm autocannon or tank gun.
Also recorded as 20 mm L/55 KwK 30; KWK30; 20L55 KwK 30; KwK 30; 20 mm tank gun KwK 30.
Overview
1935 20 mm tank gun by Mauser and Rheinmetall-Borsig.
In detail
It is associated with Nazi Germany.
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
“2 cm KwK 30”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q2980709: 2 cm KwK 30
Consult the source