On the end label of the box.
You will have to find a copy of The Standard Catalog of Smith and Wesson and check each model number.
S&W has made dozens upon dozens upon dozens of variations among its weapons. You need to provide at a minimum if it is a revolver, pistol or shotgun.
a 629 in 7.5 inch ss unfluted cylinder
To answer your question would take a few days of looking in the Standard Catalog of S&W, 3rd edition
A few hundred to a thousand or so.
You will have to call S&W. If you have the 3rd ed of the Standard Catalog of S&W, you might find it in there, but, it will take you a few days.
date code.
If you have the box, post the product code. S&W has made non-standard barrel lengths at various times for various distributors.
Impossible to answer without a detailed description to include, box, papers, finish, caliber, and Product Code. Range 100-1000 USD or more.
Contact S&W customer service through their website
It is a Challenger. A Medalist would have the product code of "T" in the sn.
the code for the crystal pistol is cristol10