I didn't realize before that there was a picture attached in the OP.
That's a lot different from the HP ones. The crystal element looks more
like those in regular packages, but on the large side, due to the low
frequency. If it's a 1 MHz, then you should be able to find plenty of
representative example oscillator circuits around that frequency. It may
be just a regular type, not for an OCXO application, but fancy glass
packaged because of its size.
Ed
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