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This is most likely a "homebrew" or homemade set from the very early twenties. All of the parts were available separately then and many guys made their own sets. The tube is very early, with its brass base, short pins, and evacuation tip on top. Don't try to test the tube or do anything to it. They are more and more rare and collectible, as is the whole set, even moreso if all is together with the tube as it appears to be. That tube is probably a WD-11. May have info marked on the base. Tube is valuable even if not good, but may be good. All I would do with this set is dust it off carefully and then clean with damp cloths. The owner may want to keep it as a family heirloom. You can get more opinions on it by posting your query with pictures over on Antique Radio Forum, the Antique Radio Discussions division.
Reece
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Reece
Perfection is hard to reach with a screwdriver.
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