Based only on the stamped part number, I would not assume this to be a CMP part. The prefix "C" isn't isn't typical of either Ford (usually more than one letter and not normally C without another letter) or Chevrolet (normally no letters) in the period. Just looking at Chevrolet part numbers, they appear to have been assigned more or less sequentially in the order that the part was developed and by 1930 Chevrolet was already past 124238 in numbers so I doubt this would be a Chevrolet designed part developed for CMP use. I also don't see 124283 in any of the CMP parts books I checked.
Having said this, it is an opinion - not a guaranteed fact. I could be completely out to lunch on this and have missed somthing obvious.
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