I have never seen the display case or certificate for this firearm, but I do own one of the pistols
The display case would not have been a wall hanger. Most Smith and Wesson display cases are glass top presentation cases that can be placed on a desk, credenza, etc.

Here is what the Texas Hold'em cased set looks like for reference (only photo I could find).
With a low quantity of firearms like this, not enough transactions get to the secondary market for a pricing trend to be established. I bought mine fairly cheap.

I find simple commemorative firearms like this one to often be a very good buy. Usually LNIB or EX+ condition firearms can be purchased for less than what a visibly used version of the same firearm sells for on the current market. Or the owners think there is an astronomical premium on their commemorative and they have it for sale for years.

The more highly embellished commemoratives carry values reflected by their embellishment. For example engraved pieces, or genuine African Ivory grips, gold wire line work, etc. will add to the value if you like the design. This is one of the more unusual display cases
I never purchase a firearm with the express intent to make a profit with it. I buy what I like. If you keep your firearms for 10-20-30 or more years (like I do), you will ALWAYS be able to sell them for more than you paid.

So the question is . . . What is it worth to you?