Maker, Warren Telechron, Inc., Ashland, Massachusetts, USA. Model Type C, 1926, serial no. 7. Page 7.

Below is an example of the Telechron master clock Type B. The second photo shows a view of the movement. The largest wheel in the movement is an epicyclical gear system that matches the rate of the mechanical clock to that of the synchronous motor. Any differences between the rate of the two is reflected on the large center hand and the cumulative difference is registered on the small right hand dial up to five complete turns of the large hand. This unit was a less expensive alternative to the Type A and was priced in 1920 at $150.00 ($3145.00 in 2010 Dollars) verses  $400.00, ($8390.00 in 2010 Dollars) for the Type A.