I had thought the 3rd gen Colt's were all made by Uberti but stamped by Colt- So now it appears they might have at least checked by Colt.
Signature Series (3rd Generation) Colt BP revolvers were made by Iver Johnson in Middlesex N.J. under license from Colt. They were made from rough castings and unfinished parts supplied by US and European (Uberti) manufacturers, Colt had nothing to do with the manufacturing, inspection or marketing of the Sig Series guns.
Fingers (Show Me MO smoke) McGee - AKA Man of Many Colts - Alter ego of Diabolical Ken; SASS Regulator 28564-L-TG; Rangemaster and stage writer extraordinaire; Frontiersman, Pistoleer, NRA Endowment Life, NMLRA, SAF, CCRKBA, STORM 327, SV115; Charter member, Central Ozarks Western Shooters
Cynic: A blackguard whose faulty vision see things as they are, not as they should be. Ambrose Bierce