Relic

Curio or relic: A firearm (see this wordreference; there are information on firearms collector, firearms source, firearms pathfinder and firearms database on the internet) manufactured at least 50 years prior to the current date or certified by the curator of a municipal, State, or Federal museum, or that derives a substantial part of its monetary value from the fact that it is novel, rare, bizarre, or associated with some historical figure, period, or event.