Yale & Towne Manufacturing Co., Stamford, Connecticut - 2 movements, T31½, T-movement pair

Model T31½, 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 in a catalog. The format for this introduction was similar to that of the K31½; 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 K31½ 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 K31½ I have dubbed this a T31½. 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