They are out there - Dixie Gun Works got a shipment in back in the 80s that were marked that way. I bought an Italian 1860 Army and a Walker that had the Colt address on the top of the barrel from them. I sold both years ago - wished I still had them. They were kind of unique. They sold that shipment and the next ones that came in were changed.
About a year ago there was a pair of Italian Colt Navies in .44 caliber sold on Gun Broker that were marked that way.(I know its the wrong caliber for a Navy). They would have made a nice collector set - but they were selling for more than the 2nd Generation or Signature Series Colts.