CA104283......CA stands for Canadian and 104283 is a fairly low number.
I'm not sure about Canadian numbers and was wondering if there could also be a U.S. number "A104283"? Or, was Canada assigned a batch of numbers not to be duplicated in the U.S.?
Canada had their own letters & numbers. After 150,000 engines built[ Aug. '29],another letter was added to 'CA' [ CAQ etc.] & they then were done in batches of 10,000 except for last smaller. batch.