The included factory letter lists this revolver as having a 4 inch full lug barrel (only 5419 with this barrel length were made), satin finish and checkered Goncalo Alves target grips when it was shipped on December 18, 1987 to Acusports Corporation Inc. in Bellefontaine, Ohio. This revolver also features a "CS 1" marking inside the frame indicating this revolver was originally intended for shipment to United States Customs for use by an agent. Many of these revolvers were sold through commercial means once Customs retired them. The CS-1 Model 686 revolvers were built to the exacting specification of the U.S. Customs armorers in Glynco, Georgia to create a supremely accurate and dependable service revolver which would stand up to the wear and tear of Customs duty. The Model 686 revolver served U.S. Customs for only a short period of time being phased out during 1988-89 in favor of more modern semi-automatic pistols, causing only a small number of revolvers to be manufactured.