Magazine Ad for Lunken Windows, which were made from about 1918 through the 1920s. The Lunken Window Company was based in Cincinnati, Ohio, but had a New York architectural office. The ad shows the estate of Charles Smithers in White Plains, NY -- the architect of the home was Donn Barber.
Ad is black and white, measures about 4 and a quarter inches by 5 and a half inches. Crisp and clean condition. The Smithers house was built in 1924, so I presume the ad was published at about that time.