Yes, the Colt Signature Series were made with some Italian parts being put together in New York by the Imperato family who also still make modern Henry rifles. In general, the Signature Series are not as well made or as authentic in detail as the 2nd Generation Colt cap and ball revolvers.
I own and have owned many 2nd Generation Colt cap and ball revolvers since I came back from Vietnam in 1971.
The 2nd Generation Colts were made on and off from about 1971 to 1982. These are mainly Uberti parts shipped in as semi-finished components which were then built and finished into guns to Colt STANDARDS.
Several companies subcontracted with Colt to assemble and finish these generally fine quality 2nd Generation Colts.
Then there is a gap to approx. mid-1990's when the then owners of Colt made a licensing agreement to allow the Colt Signature Series to be made. The agreement included that the Signature Series would be referenced in the regular Colt catalogs.
Confusion ensued.
A few years ago the Signature Series went out of business. In my opinion the Signature Series, while o.k., is no where near as high in overall quality and attention to accurate detail as the 2nd Generation Colt cap & ball revolvers.
An EXCELLENT book which included all this and more is "Colt Blackpowder Reproductions & Replicas" by authority Dennis Adler. Think book has been updated and revised. A very good read with great pictures. Also has lots of information on Italian and Ruger revolvers as well as shooting and maintenance.
If you want to shoot the Colts, author & respected authority Mike Venturino has an entire chapter on Colt cap & ball revolvers in his book on shooting Colt single actions.
Sidebar: Mike Venturino taught actor Tom Selleck how to accurately handle and shoot the Sharps rifle for Tom's movie Quigley Down Under. Tom Selleck collects guns including big bore Winchester lever actions such as the Model 1876 Winchester.