Hello Tom, haven't seen you since you had a Weasel ...
The T203B was the export version of the 1940 T203, produced around ( I think ) August 1940 after US-spec T203s were completed.
Comparing the T203B manual I have at home with the vanilla US T203 version there is very little difference. Things like fill quantities are in Imperial gallons rather than US gallons, and I remember it only shows the later front axle joint type.
I don't know of any surviving trucks so they will probably end up with a manual collector rather than an owner.