Mills bomb
Mills bomb is a hand grenade or ammunition model.
In detail
It is associated with United Kingdom of Great Britain and Ireland. The record gives 1911 as its date of establishment or first appearance.
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
“Mills bomb”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1636085: Mills bomb
Consult the source