First, I want to thank everyone for their help. Mr. Keenan, your serial number explaination makes sense. So, from that, my Colt was made in early 1917. The cylinder was updated later, maybe at Springfield armory, but using Colt parts. I have a lanyard and repro grips on order from Gun parts. Once I get these parts, I'm going to give it work out. I'll post my results.
There is still one thing that I have a question about. What does the S20 beneath the Eagle Stamp mean? I can't find any source.
There is still one thing that I have a question about. What does the S20 beneath the Eagle Stamp mean? I can't find any source.