This listing is for a vintage paper advertisement. This is a 1950 ad for a Allis-Chalmers Rocking Contact Voltage Regulators! The size of the ad is approximately 8.5x11inches. The caption for this ad is 'Installed in 1941 still no maintenance' The ad is in good overall condition, with some wrinkling / staining. This vintage ad would look great framed and displayed! Add it to your collection today!