My new service is 84000 range. It is British proofed all over the cyl and frame and has the .455 E stamp under the left grip. Wooden grips with penciled serial Nos. The cyl. and frame are in 98% condition with original bluing. Here's my question. It has a new Colt barrel which doesn't exactly match the color of the frame and cyl. The barrel is blacker where the frame has a deep black-blue color.The barrel says COLTS PT.F.A.MFG.C HARTFORD CT.U.S.A on the top and NEW SERVICE 45 COLT on the left side. Was this the standard engraving on all Colt replacement barrels or is it likely a pre WW1 replacement for the original .455 Thanks for any help.