welcome to the Forum, good question and I think you'll find the bottom line would be the gun has to be a LOW number,2 or 3 digit gun, there really is no "cutoff" numbers, its more a question of the caliber of the early guns the 357 mag and the 41 mag with so fewer made, are MORE pricy than the run of the mill ?? 44 mags,and obviously condition IS EVERYTHING, as well as having any and all of the "packaging" box, shipper and paper work...we had a few of the very early guns that were part of the Police Marksman set back then, but we sold them all anyway,and if I'm not mistaken the first one we had was the 3rd set ( guns ) that was available to the public, no big deal, and I do not look back as to have sold it years ago,sold them for around $900-950 a set, and todays 'retail values" of the current guns puts them ahead of that...soooooo
The value would be what a current market value would be of the gun you ask about , and as I said if a LOW number, some sort of "premium" then could be added,,,most of the redhawks around here , unless the 357 or 41 mags are marketable during hunting season, in the $600-650 range, the "rare" guns add about $150, very few collectors I can even think of as to them............and NO , no where near "retail" (MSRP) pricing............................
saw three Redhawks this past weekend at the gun show and the most expensive one was a 45 cal, with a scope on it and the guy was asking $750 and never did sell it, the others were $550 and $600 ( asking prices on guns that walked in the door, saw none for salee on any of the trade/dealer tables)
I know folks say check "on line" and make sure you check "finished auctions", I do NOT do "on line", I want to see and handle them, not a shot in the dark or a pig in a poke.
Good luck