Your quote allows most any babble I type. During the early 1990s your combination of slide and frame was sold as the Model 4596 through, if I recall correctly, Lew Horton. Is that what you have or was yours assembled outside of the factory? Either way I would not expect wear atypical of a standard 4506 because the 4516-1 was designed with a heavy for its length slide. The set up appears custom made for a horizontal shoulder holster.