Advice Needed X18 transistor casing - unmarked

Channel Hopper

Channel Hopper

Suffering fools, so you don't have to.
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My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
I have a batch of these, germanium pnp which all check out and are stable

So, which country are these from, and what would they have been used for ?

I guess they are no younger than 1975.20190915_184641.webp20190915_170218.webp
 
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Putting this to bed

That case was unique to STC - I have a couple of ASY66 here same case.
 
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