Tony
I think you have covered this but, regardless of instructions to the contrary, as far as I can see there is no officially enforced lettering style - at least one that was universally recognized and adopted.
Stencils depended on the make of the stencil machine or if hand cut the skill and method of the maker.
Most appear to have been hand painted either direct from the factory or in service. There are as many different styles as there are vehicles on the register.
Without going in to the many positions (vertical, horizontal, top, front, bumper, body) found on the same type of vehicle I think the best you can hope for with some standardization is they were 4 inches, 6 inches high or whatever, in plain font. Even this falls over as there are many photos of the sign writer using his talent to create all sorts of fancy fonts and scripts.
This is another subject where the pedants believe armies are like lead soldiers coming off the production lines and regulations are set in stone and universally adopted. Unfortunately the endless instructions are being directed at living people who misinterpret, can't be bothered, are too busy or find a better or easier way.
Whatever font, stenciled or painted, you put on your vehicle of the approximate dimensions can clearly be claimed to be "typical" of the period.
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