Bardon Bardon Electro-magnetic, dates and serial numbers.

William Miller

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Jul 5, 2010
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Does anyone know the number and dates of the Bardon Electro-magnetic clocks produced? I understand that the earliest advertisement for the clocks was 1923. I have a crystal regulator with the serial no. 662. What is the highest Ser. No., known to date? Any information would be appreciated.
 

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Rockford's early high grade movements by Greg Frauenhoff