All Kalifornia (pepples') Highway Patrol pistols have serial numbers starting with 'CHP'. Not kidding. Also they do not all have adjustable sights. Novak factory night sights are what I have seen on them. Its hard to tell how these pistols originally came, but many received "field mods" such as Hogue grips and spurred blued hammers. Its not hard to change the hammer on a 4006. But the one I have coming is stainless frame and slide, blued mag release, blued decocker lever, bobbed skeletonized blued hammer, integrated to the frame accessory rail, original polymer grips with dimple, Novak night sights (completely depleted). If you're keen to get one, get them while you can, once they disappear into collections that's the end of them, there ain't no more.