half-union
half-union is a coin of the United States dollar or gold coin.
Overview
Gold coin issued by the United States.
In detail
Materials recorded for it are gold and copper.
It is associated with United States.
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
“Half union”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q5641629: half-union
Consult the source