I picked up a very nice colt serial # C26xxx it looks like its been reblued but it is very tight and no wear on any of the internal parts. I have a question on serial # stamping on the civilian models. Is the serial # located in the same place as the USP 1911 models? I ask because there is no serial # stamped behind the firing pin retainer. what marks did colt use on the Civilian Government model 1911s?