In 1955, Smith & Wesson eliminated the top side plate screw, creating the

Before we dive into serial numbers, let’s clarify the anatomy. The "screw count" refers to the visible screws holding the revolver together, primarily on the sideplate and frame.

The term refers to the total number of screws visible on the frame: Four screws

The "fifth" screw is located on the front of the trigger guard. This screw retained the cylinder bolt spring. Locating and Reading the Serial Number

Because 5-screw S&Ws are valuable, fakes exist. The serial number will expose a "fake" 5-screw immediately.