I need help identifying the year and value of a revolver I got from my grandfather. I was told it was his sidearm in World War II. On the barrel it says "38 S&W Special CTG". The bluing is in very good condition, the gun still fires (although it has not been fired in 20+ years), and to the best of my knowledge, all parts are original. The serial number on the butt is 503109. Below are pictures of both sides of the gun.
Thank you for your assistance.