[servicepub (RIP)]

Admission - I am not a radio expert.
That said, the 'C' prefix was normally applied to items that were made for Canadian use - not necessarily in Canada, and not everything in Canada was made for Canadians as we manufactured to supply many allies.
In addition, the Canadian Army had a policy known as 'Continuing Canadian Supply' which identified Canadian-made goods which were for the use of the Canadian Army. This list included uniforms, insignia, helmets, small arms and vehicles. Other items were wholly dependent on both the London and Washington Munitions Allocation Boards (LMAB and WMAB). These groups would re-direct munitions and materiel to whatever part of the globe needed them the most. As radios (and many other items) were not subject to the 'CCS' policy, Canada could be equipped with radios from anywhere.
Finally, at times a 'Canadian' serial number would be applied at the factory but the item was actually shipped elsewhere.
Clear as mud?
Clive