The hammer spur is virtually identical to that on my "Roper Custom"---a Colt Officers Model 38 treated to grips/sights/action job by Walter and his lads. All I can tell you about the hammer itself is it is unlike any Colt product of the period (and is so light I swear it would float), and the prevailing wisdom (Hondo44's) is it was made by Colt to Roper's design. Whether or not Roper ever did any hammer modifications such as yours (remove/replace the spur) is unknown to me.

Let me know if you're going to be at the next Southeast Bunch gathering, and I'll bring it along. You bring yours, and we can sit and stare.

Ralph Tremaine