The official serial number is always stamped on the bottom of the grip frame (the "butt").
Model 19-5 serial numbers typically follow a triple-alpha-numeric format (e.g., "AUS8466"), which Smith & Wesson adopted in 1980. Installation: Grips and Parts smith and wesson model 195 serial numbers install
"smith and wesson model 195 serial numbers install" The official serial number is always stamped on