OP;
As to value it is usually set based on supply and demand unless you are dickering on a super rare variant (like a 36 with a 6" bbl...only 2 dozen made, and those were "off the books") or a gun with proven provenance (belonged to Elvis, etc.).
I have found that even typical supply and demand prices are further dependent on where you live (gun friendly State...easy to make FTF deals, or California, New York, others that make it tougher than nails, etc.).
The "go to" around my area for Smiths no longer made is basically the Standard Catalog of Smith & Wesson, now in its 4th Edition. The SCSW shows $ 650 for ANIB (that is As New In Box) which basically means unfired except for the factory test shots which you can usually see evidence of by checking the face of the cylinder, in its original (numbered to the gun) box with vapor paper, all instructions, leaflets, cleaning tools, etc.
Next down is $525 for Excellent, $450 for Very Good, $300 Good, and last $250 for Fair.
So when you see the gun, check for "end shake" (cylinder moves excessively in axial direction...fore and aft), lock-up (cylinder is tight when hammer cocked, "push-off" (hammer cocked and cannot be moved by thumb toward firing)...general condition of the finish (bluing heavily worn or scratched), chips or heavy scratches in the stocks.
You may already know all of the above, but I find everyone is worth personally checking out in a face-to-face environment and is why I don't buy off the Internet, however I do sell on the Internet because of the wider availability of buyers, but if you are only 1.5 hours from looking personally at the gun that you may pop any where from $350 to $500 on...it's a no brainer for me.
Added "value" in talking with an owner?...sometimes the back story of how and why they came to have the gun is funny, unbelievable, totally believable, they have proof, it truly IS that "one-of-a-kind"..........all part of the slippery slope we call Collecting.
Best of luck on your decision......let us know (if you buy it...photos posted are required or we are forced to believe it never happened)
