Yale & Towne Manufacturing Co., Stamford, Connecticut - 2 movements, T31, T-movement pair

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Model T31, 1907. I suspect this was the first time lock Yale used for the introduction of their smallest movement size known as 'T'. The model number designation is only my guess as I have yet to have seen another extant example or on in a catalog. The format for this introduction was similar to that of the K31; that is a pair of movements housed in a case with two cases used in tandem for a total of four movements. These however only contained the time locks and none of the combination locks as does the K31 and were meant to trip the automatic bolt motor shown here. I am unsure of the model designation for this time lock, given the similarity in design to the K31 I have dubbed this a T31. The reason it's believed that these are the earliest T sized movements are the serial numbers. Time lock makers generally started their numbering system at 100 or as in the Consolidated Time Lock Company, number 1000. Case #11 and #12. Movement #100, #101, #102, #103. There are only two known examples this author has seen. 3" w x 4 7/8" h x 2 1/2" d. The last photo shows this type of time lock and bolt motor set up in an Ely-Norris, Perth Amboy, NJ cannonball safe door. file 133

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