At Tulsa I observed a Detective Special. The seller explained that it was manufactured in 1918. I said "are you sure it's a 1918?" "yeah, check out the serial number. Why do you question the year?" "Well, Colt didn't build the DS until 1927." We went to the Colt serial number book and he was slowly convienced. He had $900 on the gun. I told him that I hope he bought the gun at a good price because what he has is a Police Positive Special with a Detective Special barrel.