Original 1954 GMC Dealer Parts Book. This Parts Catalog [dated January, 1954] covers the Heavy Duty Models S400-27 thru 670-50 Trucks. It has Part Numbers, Group Numbers, Description, Quantity, Application and no Illustrations. This is what the Dealer used to order Factory Replacement Parts to Repair your Truck. It is in good condition with minor wear, blemishing and soiling from use in a Dealership [see photos]. Very rare and informative piece of History that will be a great tool for the GMC Owner or Collector.