Cliff,
Not much help but a few clues for the knowledgable people on the Operating Theatre.
Engine bay is sealed indicating a rear flywheel/fan. This design was a specialty of sophisticated European manufacturers FIAT ITALA etc.
On the other hand the radiator sitting proud of the bonnet was favoured by a number of American companies. This was the REO trademark right up until the mid thirties. Unfortunately I have seen British and European trucks also with that feature.
Only muddied the water but it might jog a memory.
Lang
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