First, do what Mike says to make sure the cylinder stop is not just stuck or dirty. If not, give us a serial number, so anyone who might have parts can match it up with your era or production. If you are thinking of replacing the cylinder stop, you should be able to take off the sideplate to get to the stop to make sure if it is stuck. Removing the stocks and soaking it in a mixture of acetone and Automatic Transmission Fluid for a couple of days might do the trick.

The image you supplied looks like the Safety is in fine nickel condition. I notice the image is from 2010, was the revolver working at that time or has it always needed parts? The revolver looks to be in much too good of condition to have a worn cylinder stop???

Lastly, the caliber is simply 38 S&W, with no Short.

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Gary
SWCA 2515