1968 Art Metal Knoll 900 Chairs Ad - You ought to know what's going on behind

This is a 1968 ad for a Art Metal Knoll 900 Chairs! The size of the ad is approximately 8x11.5inches. The caption for this ad is 'You ought to know what's going on behind your back' The ad is in good overall condition, with some light wear. This vintage ad would look great framed and displayed! Add it to your collection today!