The Police Positive is a Colt model. They look pretty different. It may still be stamped that the caliber is .38 SW Special, but it would still be a Colt if it is indeed A Police Positive. Does the cylinder release push forward or back. Colt's pull back, S&W's push forward.
nhoop. Welcome to the Forum. That serial number is a Colt serial number for a Police Positive model, chambered in .38 S&W caliber. It should also chamber .38 Colt New Police cartridges. You could post your question on the Colt Forums and probably get more info., such as the ship date, etc. Ed