A high school classmate is an FFL, and came home from a Chicago gunshow about 5 years ago with a 4 diget serial # Model 40. Says a family member of a Chicago police officer sold it to him. I bought it, about 95% condition, no box. When I got it home, I found the first initial, and a last name engraved on the frame under the grips. I googled the name, and came up with a fairly famous Chicago detective. To add butter to the popcorn, my friend called about a week later and told me he was going through all the stuff he bought in Chicago, and had a pair of genuine mother of pearl grips for the M40. He gave them to me, no charge. The only thing missing was the original pin that disables the grip safety, but other pins will work.