Under the barrel (for older models) or on the back of the cylinder.

**Step 1: Identify

, a digital archive that felt more like a graveyard of steel. He flipped the revolver over, squinting at the alphanumeric code stamped into the bottom of the butt. Smith & Wesson Historical Foundation “J680214,” he typed.

– On post-1957 revolvers, open the cylinder and look on the frame in the yoke cut (the "yoke" is the hinged arm that swings out). On older guns, check the butt.

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