Original old vintage catalog CHICAGO WATCHMAN'S CLOCK COMPANY of Chicago, IL. 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 construction book, this unique one page technical data specification sheet would display beautifully matted and framed. Slight damp stain on outer edge. It would be a marvelous addition to your industrial engineering library.
- SKU z720
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