Thanks for the kind responses everyone!
I haven't been able to get the _Standard Catalog of Smith & Wesson_ yet, which Mike recommended. Info I've found on the Internet (perhaps based on Supica?) seems to date my gun between October of 1950 and the end of 1951 (serial # 21xx)...though I guess I can't believe everything I read on the Internet.
Also, thanks for the info on the concealed carry culture of the 50s. Right now, I've purchased an Uncle Mike's pocket holster and a Renegade ankle holster for it. Will definitely look for something more "period-authentic" when I have the time and money to spend.
Anyhow, I took it to the range last night and put 70 rounds through it. All the gun shop had was MagTech 158 gr. (38P) ammo as far as standard pressure stuff. This gun is definitely much more difficult (for me) to shoot accurately than my 640-1, but I guess that is understandable due to the smaller grips and lighter frame. Will definitely need to practice more to feel confident with it...but when I concentrated on my technique, the gun seemed to shoot where the sights lined up. Incidentally, the minor size difference between the .357 640 and the .38 CS makes the latter SO much easier to conceal in the pocket. I actually had not physically handled a .38 J-frame before and was about to give up on J-frame pocket carry. With the CS, I can honestly say my keys print more than my gun.
Interestingly, I got the best treatment at the gun shop I went to that I have ever experienced there. I think it was the oldest CS the clerk had personally ever seen and checked it out a bit for me. Said everything seemed to be in good working condition.
Thanks again for the replies...now I'm going to try different types of ammo to see what it likes to eat!