Hi James.
This is a regular item on eBay and was covered some time ago here on MLU.
It is what is left of a Crystal Calibrator Power Cord Assembly for use on a Mk II 19-Set. Somebody has cut off the brown ID Collar that was around the wire loom, opposite the exit side for the calibrator feed line, and the line itself. My guess would be somebody wanted a simple 6-pin Mk II dog bone and did not realize what a rare piece of kit they were hacking up.
All Crystal Calibrator kits were issued with the calibrator, a 6-Pin dog bone connector, a 12-Pin dog bone connector, and a slow motion drive and manual.
The slow motion drive was to be used on a Mk II 19-Set to replace the standard drive on the Tuning Dial. All unused parts were to be returned to Stores.
I checked with the seller of this one last year and it came into his possession in this condition.
David
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