I'm looking for information on the Combat Master I bought at our local gun show last weekend. The pistol is a 9mm and has a matt stainless finish with a rubber arched mainspring housing. The slide is marked (very faintly) DETONICS 9MM. The frame is marked Detonics .45, Seattle, WA, with a serial number of CR180xx. The slide, frame, and barrel are all marked with the same serial number. Can anyone tell me the model (Mk??), when it was built, and what it might be worth?