This is a battery powered clock movement by the Self Winding Clock Company of New York.
Self Winding Clock Company of New York
Self Winding Clock Company History
This company was formed in 1886 by Charles Pratt with Henry Chester Pond. The design was based on automatically winding the clock each hour with a motor powered by two 1-1/2 volt dry cells located in the case.
The advantage of this high-quality, pendulum-controlled movement, combined with the constant driving force of the small, frequently wound mainspring, was that it yielded a highly accurate clock subject to minimal wear.
Well, this self winding electro-mechanical clock was certainly a learning experience when it came to the disassembly and rebuild of the movement. I have very little experience with electro mechanical clocks. I had to do some serious research before diving into this one. As far as ‘time only’ clocks, this is by far the most complex that I have in my collection.
Magnetic Impulse Motor
The entire movement was designed around the magnetic impulse motor that engages every hour to wind a small main spring. In addition to the motor, there is a ‘solenoid’ to the top right of the movement which would have, at one time, received a signal via telegraph which would have been used to synchronize the time. The solenoid punches a lever down on a cam on the motion works that would move the hour hand to 12:00 every day.