[David_Hayward (RIP)]

The 0/1/2/3/4 prefixes are the MODEL YEAR codes...some 1943 MY trucks were assembled in the next year and there were no 1945 MY CMPs...all were '1944' as the orders had been placed in '44. In 1940 there were 1940 and 1941 Models on the same lines in Oshawa! '40 for Canada (existing orders) and '41 for the British!

Looking at other trucks it appears that they were being assembled in summr 1944 so this truck could have been assembled by Holden's then as well.