National Kei-Lac Co., Chicago, Illinois, "Kei-Lac Advertising Clock", time and slide projector, one spring driven balance wheel movement tells the time and another spring driven motor advances a circular panel holding 12 glass advertising slides, all

National Kei-Lac Co., Chicago, Illinois, "Kei-Lac Advertising Clock", time and slide projector, one spring driven balance wheel movement tells the time and another spring driven motor advances a circular panel holding 12 glass advertising slides, all within a carrying case with integrated light bulb and original documents. The unit received some mechanical restoration in the late 1980s as indicated by some of the included documents. This appears to include a new socket for the light bulb. The clock movement, advertising panel motor, and light bulb are all working. The light within the unit cast the images from a sequence of colored glass slides which feature advertising that was custom ordered from the company. Several of these order forms are included. The advertisements were projected onto a flat surface at night. Hands showing the actual time were superimposed onto the advertising images -- each of which has a clock dial around the outer edge. Advertisements in the unit feature Chicago-based businesses such as Marshall Field & Company, Victrola, Terrace Garden Restaurant, R.H. Baker Jeweler, Illinois Motor Co., Holsom Bread, Crosby Radio, and others. Unit comes with original contracts / order forms, photographs of the unit in action, colorful correspondences from 1924, and a few additional glass slides. This may be the ultimate advertising clock.