Henry455,
Mr. Inventory 0297 gave you terrific suggestions. I agree that asking and thinking is in order before you part (if you are considering parting with) your guns. Take some time, ask lots of questions (you will develop many more) and try to come up with a fair market price for your guns. The time you take will be proportionate to the value you will receive should you decide to sell. Heck, with a factory letter, you may find out one or both of the guns are "unique" in some way, shape or form which would make them MORE collectable and thus give you good reason to have them priced up above normal fair-market value....that kind of stuff really gets collectors excited!
Here's how you can get your letter...go to this webpage (off S&W's site):
http://customersupport.smith-wesson.com/pages/history_request
Download the Adobe form...print it off...send your completed request with as much detail (use another sheet of paper if needed) as you can...ask as many questions about the guns as you have...the stuff you want to know will get the attention of Mr. Jinks. Send $30.00 with the request and expect a couple week wait...perhaps a bit more.
I believe you will be "investing" wisely if you obtain a factory letter on both guns...you WILL get your $30.00/ea. back...in fact, I believe that after you make your best deal on the guns you should calmly add $30.00 to each gun for each letter and it will be gladly paid by the purchaser...heck, it saves them doing what they WERE going to do when they got the gun(s)!
Good luck, if you can/desire to, please keep us posted on how things go...and remember, the guys on this forum will probably pay as much or more than the fellows on the S&W Forum! (both are EXCELLENT groups with many "cross-over" members (like me).
Here is a link to the S&W Forum:
http://www.smith-wessonforum.com/cgi-bin/sandwcgi/Ultimate.cgi?action=intro
I'd recommend starting in the "1945 and after Revolver" forum as it is the largest and most active and should fit the time-frame in which your guns were produced. The folks on that forum will really enjoy you're posting the same links to your photos...then sit back and get ready for lots of replies!
Again, good luck!!
Bob