Original old tractor trade vintage ad for CATERPILLAR TRACTOR COMPANY. Main office and factory was located in Peoria, IL. This Track was Not Sealed and as it Wore, the track stretched and became snaky, prematurely wearing out roller flanges, sprocket teeth and itself.  This needn't have happened.  Caterpillar's patented Sealed Track blocks dirt out of bushings.  This 1962 petroleum magazine advertisement would display beautifully matted and framed.