50s/60s Transistor Identification

Not sure, but for parts of that era, you might also try AntiqueRadios.com. It's another forum that I belong to that is all about old radios, but this would be something that I'm sure you would get an answer on rather quickly.

 

I'm of that era, but the part number doesn't ring a bell with me.
The pin-outs are numbered one thru eight, which would indeed indicate a transformer to me. But encapsulated components, especially military parts were common back then.
Do you have an ohmeter? You can check for resistance measurements to see if there are transformer windings inside (very low resistance measurements).
It IS possible, though unlikely, that it may have been a special-purpose part, encapsulating something else.
Good luck with the search.

 

If it's from a communication equipment, it's very likely to be a "Hybrid" - 2 wire to 4 wire conversion.

Ramesh