I recently inherited nine weapons of various types.I am looking for info on one in particular.It is at least 50 years old. Barrel is stamped "Colt Trooper".38 Special.The s/n only appears under the left grip and it is scribed in by hand.Box is marked "Target Grips" "Regular Hammer.The grips do not fit perfectly,they are an imitation checkered ivory and marked "I O/P".I know what that stands for. It has holster wear but shoots great a lock /aligns perfectly.Nobody around here has heard of a .38 Trooper,I had a .357 years ago.Anyone give me any info on this ?? Thanks.