I recently inherited my grandfathers 1918 Colt 1911 - appears to have the 1913 slide with the Colt insignia on the slide back near the hammer (not inside circle). Serial number 23xxxx. Everything looks to be original based on the markings and my research besides maybe the barrel- unsure how to verify that marking. BUUUTTT I’m wondering if this gem of a pistol is ruined because pap had the gun parkerized. Please tell me the gun isn’t ruined or hasn’t lost all of its value because of this. Thanks for any and all comments from the experts here.