The car's similarly thick and heavy back window was hinged so that it could be dropped quickly, presumably to allow for firing at pursuers.

During later restorations much of the armor plating was removed and the bulletproof glass, which had become scratched and yellowed, was replaced with new glass of the same thickness.

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