Unusual (rare?) Self Winding Clock Co Hairspring movemetn model. Approx 14 inch case. Note the red bulb protuding through the loop in the Numeral 6 on the dial. Seller told me he bought this at the Alameda Naval Air Station 10-20 years ago.
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Self Winding Clock Co Hairspring Mvmt
Navy Department, Washington, D.C.
Navy personnel at work in a communications office located in the Main Navy or Munitions Buildings, circa early 1919.
Note telegraph keys on tables, switching equipment in left background, and wall clock marked "Self Winding Clock Company".
U.S. Naval Historical Center Photograph. 
I stole these last two pictures from an Ebay Auction 6501537375, Went for $860.
These last four pictures are of a 120 beat movement for a two sided clock. Note the aluminum thingy that holds the take off wheel on the front is homemade. The original was lost. I have no mechanical skills but I bet a brass one would look better.
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