1941 Series 16 Chevrolet assembled in Melbourne, the 1,089th assembled.
41 = 1941
16 = Series 16, 3 ton
M = Melbourne GMH plant
1089 the individual vehicle assembly/chassis number.
The parts list identifies these as initially having 20 inch offset, pierced steel wheel rims with dual rear wheels. Later changed to 18 inch military wheels, but many appear to have been left 'as issued'.
Have you measured the wheel base as yet? Mid front to mid rear wheel distance?
I have not as yet found an entry for that chassis number. Unfortunately, many were listed only by their engine number, which are generally in the TR1xxxxxx and TR2xxxxxx range. With no guarantee that this is the original engine, it may be difficult to locate the registration number, but I'll take a longer look over the next few days. We might get lucky yet!
Gina W: you will have noted that the vehicle is a 1941 Chev supplied from the manufacturer to the military in Light Stone colour overall.
Mike