Topfmine
Topfmine is an anti-tank mine or weapon model.
Overview
German anti-tank mine.
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
“Topfmine”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q443895: Topfmine
Consult the source