Actually, it is a misnomer that "there is no safety on a revolver." The modern S&W has built-in safeties, but there is no "switch" on a modern S&W.
The lock on the side of the frame does not count as a safety, nor should it ever be used as one!
However, S&W did make at least one run of revolvers with a manual safety for the French, of all people, and these guns are very scarce.
The safety was on the right side of that particular revolver- it looked almost like the cylinder release and operated similarly. It just locked up the action when moved into position. However, why they wanted said modification is beyond my powers of comprehension!
