I recall my dad mentioning this is a chiefs special. .38 snubby with stag grips with 91642 on the butt. No model number on the yoke. He carried it as a back-up to his service weapon as a small town cop in Alabama in the '60's and every day until his death in October of last year and it's become my most prized material possession. Any information, including date of mfr, would be greatly appreciated.