Hi all - for the edification of all I have now answered my own question of the two switch plate configuration in Australian Cab 13 Chevrolets. I found an example and have managed to decipher most of the script. It is in the below detailed truck that I'm posting in the Sell section. What I need now is a good image of these plates or to borrow them to replicate.
General Motors of Canada Ltd
Chassis Model R106
Cab Model
Chassis Serial 3-8443-60514 M
Engine Serial PR 3946943
Order No E-52-384
Date of Mfg 30 6 44 AUS M
R106 is a RAAF designation - a C60L. This one possibly had a steel dropside GS body. It was assembled in Melbourne.
Bob