For one point: what is this, who built it, and when?
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This should be a Light Armored Car T-1 built by Pontiac in 1928. One of two such prototypes built by them.
It was also sometimes called a Cavalry Recon Car.
Other similar vehicles were built in the 1925-1930 period by Ford, Chevrolet, Willys and Cadillac.
Voila!