Yes, Don, those old quartz bars are rare and amazing:

http://leapsecond.com/museum/gr676b-50kc/
http://leapsecond.com/museum/gr1190a/

The inside joke is that recently Don gave me a new one, also GenRad, that I 
hope to photograph and measure soon.

Thanks,
/tvb (iPhone4)

On Jan 22, 2013, at 3:04 PM, "Don Latham" <d...@montana.com> wrote:

> 
>> 
>> 
>> Anybody out there with a pre-WWII GR 100KHz bar standard might find a
>> whole
>> new customer base.
> 
> I'm absolutely sure that TVB has one :-)
> Don
> 
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