Re: Unknown transistor osc.
SEI also made a range of "block" crystal-filters that were extensively used at the first-IF [10.7MHz] selectivity-blocks in Pye two-way radios [Cambridges, Vanguards, Westminsters, Europas] in days-past.
The designers of these filters really knew their stuff, and I would expect your 'encapsulated oscillator' to show similar levels of engineering excellence.
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