2nd Generation C series Colt's (1851 Navies and 3rd Model Dragoons) were made by Colt's Manufacturing Company, Inc, in Hartford from 1971 through 1978 of semi finished parts provided by Italian and US manufacturers. F series 2nd Gens were made in Middlesex, NJ by Iver Johnson of the same semi finished parts. All 2nd Gens were inspected, accepted, marketed, sold, and warranted by Colt's
Signature series Colt's were made from 1994 through 2002 by The Colt Blackpowder Arms Company in Brooklyn, NY. They were operating under a license from Colt's to use the Colt name. Sig Series guns were made from semi finished parts provided by Italian and US companies same as the 2nd Gens; but Colt's had no part in the inspecting, marketing, selling, or warrantying of the Sig Series guns.
Here is a link to an article about the Colt BP guns.
http://www.gunsandammo.com/content/cap--ball-resurrection