[Hammarlund] FS-135-C Crystal Calibrator

[Kenneth D. Grimm, K4XL]

Does anyone have any information on the Hammarlund FS-135-C crystal
calibrator unit?  I recently acquired one with a bad crystal and with no
documentation.  Does anyone know anything about this little gadget?
When it was produced and for which receivers?
The Hammarlund Historian has info on the XC-100 but not on this one.
Any help would be greatly appreciated.
73,
Ken K4XL
k4xl@arrl.net
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