Thanks to all the gentlemen for your responses. I'm on the trail of the "Standard Catalog of Smith & Wesson" now. Great tip. Should be able to get more information there.

debracin, sorry I left out Model 43. Didn't know it existed. Also nice pictures of the three J frames; 34, 43 and 63. Which reminds me of my question number 2. I'll ask it again another way. Ignoring barrel length, when you examine each model shown in your picture, what differences do you find in them? BTW, my 34-1 has a round butt.

Regards
HAM