</a> Courtesy Smithsonian Institution National Numismatic Collection. Rare Currency at The Smithsonian The previous coin's older brother the 1849, Gold Rush era double eagle gold coin is valued by collectors the world over. It was the United States of America's first $20 denominational gold coin. Courtesy Smithsonian Institution National Numismatic Collection.
subspecies - (biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species. race. biological science, biology - the science that studies living organisms. taxon, taxonomic category, taxonomic group - animal or plant group having natural relations.
variation-an artifact that deviates from a norm or standard; he patented a variation on the sandal. mongrel, bastard-derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin; the architecture was a kind of bastard suggesting Gothic but not true Gothic.