bill on all things about any Smith & Wesson......... go to the official S&W forum.
smith&wessonforums.com
Roy Jinks, the head historian & grand old man of S&W hangs out there as well as Lane................... Details you'll need for getting a factory letter is posted there & you'll meet a good bunch of guys who really enjoy collecting, carrying & shooting those well made handguns..................There are separate boards/forums there for both antique & modern weapons & the modern weapon forums are broken down further into important eras/changes that the pistols & their maker went thru as they evolved.
be safe, enjoy life, journey well
da gimp
OFC, Mo. Chapter