AAA HELP need help

[CWO (ret) Gilles Aubé]

Can the same serial number be used on a different GM model?
My number is : C15A #C14441-M 1500CWT serial 38442422564.
The Montreal police got on file a number AU 38442422564, that was recorded for 1948, I beleived the C15A building stop before 1945?
According to the serial plate my C15A was build in 29 Sept 1943
They will not release the form for registration.

Can someone help me please ?