According to my information, the Colt 2nd Generation revolvers were made by Colt in Hartford, Connecticut.
The company bought the rough castings from Uberti in Italy and then machined and assembled them here.
This was in the years 1971- 1976.
In 1978 thru 1988, Colt farmed out production to Lou Imperato and Iver Johnson Arms in Middlesex, NJ who continued to machine and assemble the guns.
These guns during this period were made and inspected to Colts specifications and Quality Assurance standards.
All of the 2nd Generation pistols are considered to be genuine Colts in every respect.
The 3rd Generation Colts, 1995-2002, often called the Signature Series Models were manufactured by "Colt Blackpowder Arms Company" which was basically the branch of the old Iver Johnson that had taken over making the 2nd Series.
This was done under a licensing agreement with Colt and the resulting guns are considered to be genuine Colts.
This explains why another company could stamp the Colt markings on the guns.
These guns still used the Italian rough castings but the parts were machined, blued or color case hardened and assembled to Colt specifications in the USA.