My buddy has 2 old colt revolvers and wonders when they were made. they both have plastic grips and are single action. one is a 38WCF s/n 311004 and the other looks like a bisley design, 45 colt, s/n 252656. Any help is appreciated, Thanks, Richard. Also a guesstimate of the value of them. Both have petina inside barrell and out side of gun but actions work and are smooth and lock up tight.