[Boatanchors] Handbook sought

[dartaviation@btopenworld.com]

Good day Gentlemen,

Does anyone have or know of a source for a handbook for a Hewlett Packard Precision Oscillator type HP107BR please.
This is a 5Mc/s precision oscillator that is used to provide the reference standard for a Hewlett Packard Synthesizer.
I have tried to contact HP direct but without success.
One of their employees insisted that they had never made such an instrument!  I must have one Hell of an imagination then as the thing in front of me goes about 40 pounds weight in a 19 inch by 5 and a quarter inch cabinet!!
Any information would be very much appreciated.
Thank you all in advance and all good wishes.

Clive  GW3WEQ