Type 97
Type 97 is a 81 mm mortar or artillery model.
Also recorded as Type 97 81 mm infantry mortar; 81 mm mortar Type 97.
Overview
1930s 81 mm mortar of the Imperial Japanese Army.
In detail
It is associated with Japan.
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
“Type 97 81 mm infantry mortar”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1014037: Type 97
Consult the source