I rescued a well-used 5-screw 38 spl.S&W revolver with a 5-inch bbl and adj. rear right from a local pawn shop. What really caught my attention was the unusual target front sight: silver two part base topped w/ a 1/16" piece of brass. there is one screw behind the sight blade. This is not something homemade- it fits perfectly and has vertical serrations on the rear of the base.An ace trigger shoe was installed. Pistol is #289407. Could someone please tell me what era this gun is from and who made these sights?I plan to use it in Harry Reeves/DR matches. Thanks!!!