Alex,
Thanks, for the photo, their super nice. If you have any more angles on the 1-C and the 2-C, I sure wouldn't mind eye loving-em. About the C series, I think their was the early C (1935), and the 1-C (1935-1937), the 2-C (1937-1938), the 3-C (1938-1939), and the 4-C (1939-40 or 41). The early C is prehaps the rarest I think, because it had no light, nor cover. After that one, nothing but lights. They say that their is four C models, but in fact their is five, if you count the early C, not to mention the R series which branched off from the C's.