I recently acquired a Colt Official Police, at least I think that's what it is.
Patent dates are 1884-1905. It is marked "Officers Model 38" on the left side of the barrel. SN is: 4838xx It has adjustable rear and front sights. The rear top strap has tiny lines for aligning the rear sight. The front is a blade held in a rectangular block. It a good shooter, and the SA pull is VERY light.
Is this a Target model? Approximate year made.