I agree with Paul you don't tend to see them in sets after the early 1960's however I do recall Russian sets with transistors of a similar design.
Cannot remember the sets brand but the transistors were all in sockets.
This would have been around 1968.
By the time the set came to me they were all mixed up and back to front
You can see the Ediswan Transistors (and many others) here
http://www.wylie.org.uk/technology/s...an/Ediswan.htm
Cheers
Mike T