Armor plate
The 90-horsepower Cadillac was fitted with 3,000 pounds of steel armor plating and nearly inch-thick window glass. Spring lifts allowed the heavy side windows to be rolled up and down.

The car's original heavy armor plating lends credence to the notion that it was not used as an actual Chicago police car. It would have been too heavy and slow for real police work.

by Peter Valdes-Dapena, senior writer @CNNMoney - Last updated September 27 2012: 3:15 PM ET
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