Early 1974 for the A2374xx is likely.
No way on this planet does the FANTASTIC Standard Catalog of Smith & Wesson, 4th Edition by Supica & Nahas cost $147 new. Amazone shows it for under $51 right now. It's a terrific book and money very well spent.
Welcome to the forum! Quick tip, there's no harm whatsoever in opening a new thread for your questions. Some folks get confused when you bump up a many-years-old thread with a common question.
I love the Model 52.