Each Smith & Wesson revolver, including the Model 66-4, is assigned a unique alphanumeric sequence during manufacturing. This sequence permanently marks the firearm and serves as its definitive identifier. For example, a Model 66-4 might bear a serial number like “BDD1234.” These identifiers are typically located on the frame of the revolver, often on the bottom of the grip frame or crane.
These unique identifiers are essential for several reasons. They allow for precise tracking of the firearm’s history, including its date of manufacture, and any registered owners. Law enforcement utilizes these identifiers in investigations, while collectors rely on them for authentication and valuation. Understanding the significance of these markings is crucial for anyone involved with these firearms, whether for historical research, legal compliance, or collecting purposes. The evolution of these identifiers often reflects changes in manufacturing processes and company ownership throughout Smith & Wesson’s history.