I just inherited this gun from my father and am looking for any information about it. It's barely legible but it says "38 S&W Special US Service CTG" on the side of the barrel and has these patent dates on the top of the barrel Apr 9 80, Mar 27 94, Oct 4 98, Oct 8 01 Dec 17 01. It has a 5 digit serial number with no letters and no address stamped on it. Any info would be great, very interested in the model and age.