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I thought only Buick had the "portholes" ornament, but your scan is definitely a Chevrolet - nothing lightweight about it. Some info on the 1947 Chevrolet Fleetmaster Convertible...

Price New: $1628

Production Total: 28,443

Engine: 217 cubic inch inline-6

Horsepower: 90 @ 3300 rpm

Curb Weight: 3390 lbs