Cutlery Shoppe Ti Police models are 30% serrated. Spyderco-sold models are 100% serrated. Both are identical to steel Police models except that they have Ti handle scales (pins are still steel, and thus visible) and ATS-34 blades (marked as such) with no "POLICE" stamp.
Spyderco has given a variety of answers regarding the number of each produced (both on the forums and on the phone), and if there was an "official" number, I have forgotten it. Suffice to say that there were not more than a "batch" (1200) of either, and likely fewer. They have some collector value, but are also great "using" knives, and I'd only give mine up for the 30% serrated model!
-Drew