L193 Smith & Wesson Used L Frame Model 581 Thumbpiece & Nut .357 Magnum k648n In this case we can

In this case we can possibly still find the part you need with the serial number

38 Special 2" Blue 5-Shot Cylinder — Part #J539

or for spare parts

Smith & Wesson J Frame and X Frame Cylinder Center Pin - Part #229420000

L193 Smith & Wesson Used L Frame Model 581 Thumbpiece & Nut .357 Magnum k648n In this case we canL193 Smith & Wesson Used L Frame Model 581 . 357 Magnum Blue Thumbpiece & Nut Please call or email with any questions! How to determine the model number of your Smith & Wesson Revolver. Swing out the cylinder , check behind the yoke on the frame for a MODEL NUMBER. Model numbers began in 1957 58. So if there is no model number then your revolver may be older than 1957 58. In this case we can possibly still find the part you need with the serial # . If