The accompanying factory letters confirm both the finish and checkered walnut grips and states that this revolver was part of a 10 unit shipment of the Triple Lock Model 4 and 6 1/2 inch barrel lengths when it left the factory on June 18, 1917 to be delivered to Shapleigh Hardware Co., St. Louis, Missouri. The letters also state that the records did not list the barrel lengths by serial numbers and there were no special notes. Although not confirmed by the factory letters, knowledgeable collectors are convinced this revolver originally left the factory on June 18, 1917 with an extra barrel. Note that both barrels are factory numbered to the gun. Moreover, the revolver is absent of factory rework markings, thus indicating that the revolver was not returned to the factory to receive the second barrel. The matching serial number is found on the butt, cylinder, both barrels and right grip panel. The assembly number "6717" is stamped on the yoke and crane. The revolver has standard S&W markings (includes both barrels), and the barrels measure 4 and 6 1/2 inches. Barrel lengths other than 6 1/2 are highly desirable by collectors. Over the years the Triple Lock has gained something of a cult following. Most S&W experts are of the opinion that the Triple Lock mechanism was more an expression of the ultimate in precision machine work than as a necessity for strength and function. S&W's usual two locks provided more locking strength than their main competitor Colt. Provenance: The Ray Cheely Collection; The Chad Gripp Collection; Property of a Gentleman