I believe yours is a late 70s-80s model 3rd Gen. New production Colts are available for $1200-1400 or so street price last I checked--depending on finish and options--so I would certainly say no more than that. Lots of older 3rd Gen owners are amazingly trying (some succeeding) selling theirs for what you can buy new--or more! Knowldgeable buyers normally "don't buy it" unless the gun in question is a limited/special edition, especially since Colt quality seems to be up since/coincidental with re-intro of the removeable cylinder bushing in Spring 2003.
The "however" is - The main thing you have going for you is that, AFAIK, Colt is still not (again) chambering its fixed sight SAA in .44 Special - at least as a "discreet" (ie, non .44-40 convertible w/ spare .44 Sp cyl) catalog offering, though it is with the New Frontier re-introdiced last year. SO, though more of a niche market opportunity, you've got a "special" caliber some may be willing to pay more for--again meaning close to what folks can get other calibers for now - new.
Give $1100-1150-1200 a shot for a hoped-for reasonably quick sale, if that's what you're looking for.