There is a later color episode of "Dragnet" in which Sgt. Friday shows his revolver to a robbery victim to help her ID the type of handgun carried by the suspects. I remember that close up as being of a S&W Model 12 with a flat latch and "fish hook" hammer. I recall the front sight on that pistol as being of the half round variety, not the later ramp. I could be wrong on that though. Don't know the name of the episode...

In Adam-12 , I noticed that Malloy also has a "fish hook" hammer on his K-38 and his later Model 15. His revolvers also have "Fuzzy Farrant" stocks.

Adam-12's Officer Reed starts out with magna stocks on his S&W, but later adopts a set of Farrant stocks. In the later part of the series the hammer and trigger of his Model 15 appears to have been polished or plated.

Great shows... Jack Webb was a class act!