stunning piece!!!
That is one gorgeous Python you have. I am no expert of any kind but I did own a S&W Model 60 no dash that was very nicely engraved and I did some research into firearms engraving and the different styles and found some interesting points about my Model 60.
Mine had shipped to a Mr. Benjamin Shostle in Muncie Indiana. Mr. Shostle owned and operated his firearms engraving shop named "Gun Room Studios" out of the basement of his house. He was also the Founder and first President of FEGA (Firearms Engravers Guild of America).
His personal style was known as deep relief, hand carving consisting of floral scrolls and fine detail over dark matte background.
I've always thought that most privately engraved (outside of a factory) firearms were signed, name or initials, somewhere on the firearms proper, however like I said I am no expert at all in this field.
I suggest you go on the FEGA website for more info. Possibly also jump over on the Colt forum and maybe someone will recognize if it is a factory possibility.
Also....hopefully....there are some real true experts in this engraving arena on this Forum and maybe one or more will be along later today and chime in.
Have you removed those great grips and checked for initials or signature there?
Definitely a sweet handgun you have there....even if the cylinder rotates the wrong way.
