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Bardon Bardon Electro-magnetic, dates and serial numbers.

William Miller

Registered User
NAWCC Fellow
NAWCC Life Member
NAWCC Member
Jul 5, 2010
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.