[David_Hayward (RIP)]

G'day Mike! If that cab is a Holden one then the Canadian designation was 1301 Special Chassis for Australia CKD, in the 1/2 ton range. Note the "C" prefix indicating light Commercial 216, whereas the heavier trucks above 1-ton had "T" prefixes.

Here's an Oshawa equivalent to compare:

GENERAL MOTORS OF CANADA LIMITED
MADE IN GM CANADA
OSHAWA WALKERVILLE REGINA
MODEL 1314
SERIAL 0-131403876
ENGINE C2804748
BODY SERIAL 3776
PAINT 33
TRIM 279
Engine # C2,804,748


and a very, very rare Regina one:

GENERAL MOTORS OF CANADA LIMITED
MADE IN GM CANADA
OSHAWA WALKERVILLE REGINA
MODEL 1314
SERIAL 0-131480039
ENGINE ??
BODY SERIAL 9 !!!!
PAINT 33
TRIM (blank)