The difference between the 34-2 and the 34-1 is 1. 2-1 = 1. Sheesh. 8 years in college huh?
The real reason for the -1, -2, -3 etc. is an indication that there was an engineering change on the model which is designated by the -number. For everything you ever wanted to know about Smith & Wesson handguns, go to
www.smith-wessonforum.com.
Those guys know all there is to know about them. There is also a book by author
Jim Supica called "Standard Catalog of Smith & Wesson" that is the bible of Smith & Wesson handguns that is supposed to have all that information. I haven't seen a copy of it, but it is highly respected. Here's a link to the book:
http://www.bestwebbuys.com/Jim_Supica-mcid...=b-authorsearchRegards,