Best left to a trained gunsmith.
Proofhouse.com has Colt sn data. Should be sometime in the 80's
For Colt series,try www.proofhouse.com
You will have to call Colt to find out.
On line aucitons, gun shop, gun shows.
Colt, gun shop, gun show, pawn shop, on line, egunparts, for sale ad, garage sale, estate sale.
I believe a roll mark is the imprint on the side of the barrel or slide which shows the make, model and other particulars about the gun.
I suggest you get ahold of Colt on the phone or online. Either way you should be able to get an owner's manual. You could also go to your nearest gun shop/gunsmith and ask for help. In any event, ask for help if you are inexperienced. We all started out that way, regardless of whether it's with a Colt 45 or a car.
A Colt .357 Mark III nickel plated revolver is worth between $500 and $750. The actual value varies greatly based on the gun's overall condition.
300-700 depending on condition
he used a 357 colt magnum revolver S series (1887)
No
no.3 scofield smith wesson 45 long colt