Welcome to the Forum! You didn't provide us with much information about your S&W Model 686 (e.g. barrel length: 2-1/2", 4", 6", or 8-3/8"), so we're kind of guessing on what you have. Murphydog is correct with his 1982 manufacture date based on your s/n AAL2493. The Model 686 .357 Distinguished Combat Magnum (stainless steel) was introduced in 1980 and continued until the 686-1 was released in 1986. There were special production runs of the 686 for certain firearm distributors (Lew Horton, etc.) as well as for numerous federal and state law enforcement agencies. Do you happen to have the original box for your revolver? If so, the label will have the s/n, a Product Code, and a Spec Features number. That information will identify when a revolver was manufactured, what features it has, and if it was a special order. You may have a revolver that is worth more than just a standard Model 686. 686s are great revolvers...fun and comfortable to shoot, and accurate. Enjoy!