Your dealing with a Springfield edition .45 caliber 1911. theese were used in WWII. After the army tried the .38 spc. The 38 was to much a low power caliber to stop the japanese and others they were fighting. Most of the enemy's were dopped up on drugs and anphedimines so they would feel little pain there for the soldiers would have to empty clips into the enemy before they would come down. So the army adopted the .45 round, it was a heavier caliber with better ballistics with better take down power than the smaller .38. But anyways your 1911 is in excellent shape. keep it oilled regularly and dont sell it.