Sargent & Greenleaf, Rochester New York - 1 movement - modified

Model #4 - Corliss. This model was used (in pairs) exclusively in Corliss 'Cannonball' style safes. Note original etched glass which often is missing due to breakage. Sargent and Greenleaf invented the first practical time lock and made their own movements. Most other firms, notably Consolidated, Yale, and Diebold used movements from outside suppliers mainly E. Howard & Co. Around 1902 Howard exited the time lock business and Seth Thomas filled much of this. Other makers who arrived later, as Bankers Dustproof and and Mosler Safe Co., then used American Waltham Watch Co. pocket watch movements. Beginning around the 1950's movement production shifted from the United States to Switzerland. Sargent and Greenleaf ceased production of their own movements due to high domestic costs in 1953. This is a very early example of an expertly modified time lock. It probably was done sometime between 1906 and 1915. The substituted movement is a fairly rare Banker's Dustproof Time Lock Co. product and this company was only in existence for this brief nine year period. It's doubtful a Bankers Dustproof movement would have been used after the company went out of business. Notice on the back side of the case how it had to be milled to accommodate the Bankers lock. Retrofitting of time locks occurred when there was a lack of parts or personnel to service older time lock units. Curiously, in this case, it should not have been such a problem at this early time. Modified time locks were done by a few experts whose work was respected and trusted. After all, if the lock were to fail completely, the door could not be opened. While a regular time lock had redundancies built in from the factory and thus a very low probability of total failure, a modified lock with altered parts common to all the movements like snubber bar drop lever or bolt could, if made poorly, cause a total failure. In the entire history of the use of factory installed time locks with redundant movements, when the lock was properly used and serviced and in the absence of tampering or efforts at forced entry to the safe, there has never been a total failure of a time lock resulting in the door being unable to be opened. The case on this example is in the best condition I'd ever seen, fully pristine deep gold plating and superb crystalline damascened (jeweled) pattern.  file 83

Most time lock modifications were performed on S&G locks since this company made their own uniquely configured movements. Early locks that used less commonly available movements, particularly those before the introduction of S&G's modular style movement lines after 1890 were candidates. Even so, modified locks are quite rare. It was an expensive procedure done from absolute necessity, and the risk of a catastrophic failure, while remote if done properly, was still a deterrent to the conservative banking community.

Other modified time locks.