[MRCA] wuzzit?

[Gene Smar]

Anybody know for sure what this is? I'm thinking a vacuum cap.
The father (non-ham) of a friend recently died and I'm told had a collection of old tubes. I've been asked if someone can use them. Not sure if that means they will be given away or sold but I will be sent more photos of the collection and will post them here. I'll find out more about the giving vs selling question for y'all.
73 de Gene Smar AD3F



Sent from my Radio Shack TRS-80 model 100 laptop
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