You've got a definate KEEPER! Borrowed this info from SmithNut.
"After the CS-1 production run (both for Customs Service and over-run guns shipped to US distribution), the factory left this model in the "line" for future law enforcement orders. Think of the CS-3 as simply the same model as the CS-1 but a later engineering change. The basic CS-1 features are there - bead blast finish, round butt gripframe on both 3" and 4" models, and a pinned in front sight. The CS-3 also has the later - CNC machined - ejector star that appears to be a square cut (due to the CNC machining), as well - the front sight is wider - 1/8" instead of the CS-1 model's 1/10" wide blade.
Many CS-3 guns were shipped into US distribution, but the majority that I've seen were actually shipped to S&W's German distributor - Wischo - and marked on the sideplate as ".357 Security Special". These guns were 3" guns. They were apparently slow sellers and many were returned by Wischo and released into US distribution".
I have the 3" version that I just acquired and shot it yesterday. It's a fantastic revolver with a great trigger and action. Have it and my CS-1. They are both shooting machines! Great triggers and the perfect SD revolver IMO. Milk jugs are not safe at 100 yards with these revolvers if you do your part.
Congrats on a great S&W. DON"T SELL IT! EVER!
I'm speaking from the vast knowledge learned by attending and receiving my masters degree from DMU (Dumb Move University)
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I'm not proud that it took me 30+ years to receive this honor.
CS-3
CS-1
I'm waiting till after Christmas to post new pics of the revolvers with their new Ahrends and TT Gunleather holster.