Hammond has been known to make transformers.
My vote would have been for a balun (balanced to unbalanced transformer) as is 
often used in audio transmission lines, such as telephone lines.
Have you tried putting a meter on it?

-- FL



>________________________________
> Fra: Jean-Louis Noel <j...@stben.net>
>Til: Discussion of precise time and frequency measurement <time-nuts@febo.com> 
>Sendt: 2:24 tirsdag den 15. januar 2013
>Emne: [time-nuts] hammond 77589
> 
>Hi all,
>
>Will someone know what it could be?
>http://www.stben.net/DSC_0338.JPG
>http://www.stben.net/DSC_0339.JPG
>
>Thanks for your help.
>
>Bye,
>Jean-Louis
>
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