unique 1930's three movement bank vault door time clock salvaged from a chicago bank building undergoing renovations. the chronometric satin yellow brass clock was manufactured by the diebold safe & lock co., canton, oh. the sophisticated vault clock was used with the multiple bolt-work of a safe door that would be automatically dogged or locked and unlocked at predetermined times - the dogging and releasing would be activated by the operation of the time mechanism and/or operator. the machined case retains the original hinged door with full beveled viewable glass pane with manufacturer markings lightly etched along the bottom. the movements were likely manufactured by e. howard. measures 5 1/4 x 5 x 4 1/4 inches.