I have some similar, that came from some old HP OCXOs. They look like
they were built inside octal tube envelopes, without the pin bases. I'm
pretty sure they are 1 MHz, and came from some HP51110 (I think ?)
reference generators, part of one of their ancient synthesizers - it was
a two-piece rack mount beast, with bundles of coax between. I junked
them out long ago, and saved the ovens and crystals and some other stuff
for possible reuse. I also have some others from ancient, unidentified gear.
One thing I recall is that at least in one, or maybe all, the crystal
itself is shaped like a double-convex optical lens, not a flat disc.
Ed
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