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What a neat memento from dad. A fine reminder of a more "relaxed" time when it took awhile for correspondence as opposed to texting/twitter.
Reading the engine specs was a kick too, I've got a 3/8 Potvin in the '30 roadster, love it.
As to the hardtop reference, you might have seen the old pictures of the CRA (California Roadster Association) events in So. Cal., cars that inspire the track roadster styling that some rodders emulate. Hardtops became the shorthand name to differentiate the roofed cars that competed on the dirt tracks under different sanctioning/rules.