Yale & Towne Manufacturing Co., Stamford, Connecticut, 1 movement, Model LS31 (the Duplex)

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A. Model LS31. (sometimes called a 'bathtub' time lock due to the shape of the brass case housing the combination lock) and marketed by Yale as the Yale Duplex Time and Combination Lock. This time lock was designed specifically for use in a bank chest designed by the Manganese Steel Safe Co. Each lock contained one Seth Thomas made 72 hour movement along with a four tumbler combination lock. The safe contained a pair of these so as to encompass two combination locks and two time locks. Unlike most time locks, with the exception of Consolidated, these operated directly on the combination lock rather than the safe's bolt work.  Curiously, this arrangement seems to violate the redundancy principal incorporated in all later made time locks where there are a minimum of two movements used. This prevents an unintentional lockout should one movement fail. In this design we have two independent combination locks, each controlled by only one time lock each. To open the safe both combination locks must be dialed in correctly, so if one time lock should fail preventing the combination lock from being used, there would be a lock out. This configuration had been abandoned very early on and was only used in the early production of time locks used in Hall Safes. Production runs for this lock ran from 1904 through 1915. Of a total of about 2000 of these locks made, about 300 of these locks are now known to survive; fewer than 100 in sequentially numbered pairs. Movement #32,393 case#541 and #32,394 case#542. Two movement version. Cannonball type safes were one of the most popular models made and many time lock companies made locks that could work in this type of safe such as Diebold, Banker's Dustproof, as well as Yale's Y-361 and Triple L . file 17