Reveal partial SN# (hide only last 2 or 3 digits) to us if he has concern sharing the full SN#.
Just look at the photos you provided, appears to be original finish. I would bet it is a 1943 Colt. Please also check:
1. underside of the barrel. The marking on that is critical to determine if the pistol and barrel was from the same time frame
2. Check slide firing pin channel, it should also have a SN# that match to the frame SN# if the pistol was below SN#1,138,xxx range.