I inherited a .38 Cal. revolver from my father. It belonged to his father. I would like to know when it was manufactured. It is .38 caliber special, blued with pearl handles, hand ejector, serial number 131566 on the butt, 5" barrel length, fixed sights, it does have a strain screw, no butt swivel, it has 4 screws on the right side, no screw in front of trigger guard, it does have an upper side plate screw, it does have a trigger guard screw. Thanks in advance to anyone who replies with information.