This is a strange one. Early gun, serial number starting with a S. Fires 45 auto rim or 45 acp with moon clips. Has a 6.5" barrel with adjustable sights. Here is the odd part. Frame is marked 28-2. Could have been a 28 at one time that someone has changed or a factory error. It is in great shape and locks up perfect. Tighter then most new Smiths.