I just bought two Marx CVs off Craigs List. They have the older two piece pickups. One is black with black name plates. The other I thought was rust with brass name plates, but after a bit of cleanup, it appears to be copper coated (painted?) I took the engine further apart to clean it better, and it is also copper colored under the nameplates. It is painted black on the inside. It also appears the two domes are copper colored as well.
Did they make the CV in copper? I recall the Mercury in copper, but never heard of a CV. It's pretty shot, I was cleaning it up to repaint it (I think a fire engine red CV would look great pulling my modern Marx Christmas trains). If this item is particularly unusual, perhaps I'll find a different one to redo.
J White