The 3124 only appeared on the 1957 Chevrolet front fender. What color was your truck originally? Cameos only came in a few colors, and if memory serves me, they were all two tone (body color and cab reveal color). The interior was unique to cameos and again I think it was two tone with dimples. Does the original color of the bed match the original color of the firewall?

OK, I've been thinking. if you have the original 265 engine, you may have more accessories ie: power steering, power brakes, bumper guards etc. Those are some clues to whether you have clone or the original. Those items were options, but I have rarely seen them on the regular trucks. You do have the deluxe heater and deluxe chrome so it leads me to believe that you may have an original cameo. but then again, who cares! What you have is the makings of a nice truck and hopefully you have most of the original parts too. The seat pattern design is different than the regular trucks, it looks more like the design on the 55 bel-aire hardtop. Look for the paint color and trim number on the vin tag, this will let you know what was used originally. I don't have the color and trim codes, but I am sure there are those on this board that do. Good luck!