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If you have a vintage , these were produced by the government-run National Armory. You can cross-reference your serial number with documented production blocks:
Performing a firearm is the most effective way to determine its age, production batch, and historical significance. Because "Springfield Armory" refers to both the original U.S. National Armory (closed in 1968) and the modern commercial manufacturer (Springfield, Inc.), the lookup process depends entirely on which type of firearm you own. How to Find Your Serial Number serial number lookup springfield armory