Original industrial trade vintage catalog for CHICAGO WATCHMAN'S CLOCK. COMPANY. Main office and factory was located at 1526 South Wabash Avenue, Chicago, IL. Manufacturers of Watchman's Clocks. Stationary Keys. Carried by watchman on security rounds at stated intervals to the patrol stations, each station having a key which fits the clock. When this key is inserted and turned it registers on a paper dial within the clock, in an embossed figure, the exact time of registry. Lock Station Box and Flush Type Box pictured. Disbound from a large 1931 industrial catalog, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro industrial security equipment library. Slight damp stain on outer edge.