ophicleide
ophicleide is a keyed chromatic trumpet or type of musical instrument.
Overview
Keyed brass instrument.
In detail
It is associated with France.
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
“Ophicleide”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q200823: ophicleide
Consult the source