Yale & Towne Manufacturing Co., Stamford, Connecticut - 3 movements, Type Triple K
A. Model Triple K. c.mid 1890's. This lock uses Yale's' medium sized Type L movement. The space on the side contains the mechanism for the bolt dog. Locks produced early on had the full glass door. A few years into production the door design was changed, see next example B, where the winding holes were through the metal door rather than the glass to prevent breakage in connection with sloppy insertion of the winding key (this example has replacement glass without the winding eyelets). This lock was introduced concurrently with the Triple L and the same design changes to door occurred in this model also. The early case number puts this very early in production, however the movements appear to be a bit later. Case #65, consecutive movement numbers, 7373, 7374, 7375. 6 1/2"w x 4 1/2"h x 3 1/8"d. file 144 B. Model Triple K. 1904. This example exhibits the redesigned door. Case #370, movement #21885, 21886, 21887. 6 1/2"w x 4 1/2"h x 3 1/8"d. From a bank vault in Stockbridge, Michigan. file 0 C. Model Triple K. c. 1910. This example has the later brass colored case design with a circular machined pattern that superceded the nickel plated cases. Case #1628, movements consecuatively numbered #40141, 40142, 404143. file 148
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