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The 37mm cannon was useful against the early war tanks, the Panzer 1 and 2, and the 38-T. It was marginal against the Panzer 3. It was also useful against armored cars. The American Stuart light tank had a 37mm main gun in the turret.
This model does not have any parts for an engine, the hood is not openable.

Looks like it's this gun or a variant. Odds are they were soon unable to handle a tank as armor advanced, but it would have been good against armored cars, half-tracks, etc.