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Unsealed. Probably made by Sylvania in the late 60s early 70s.

Unsealed. Probably made by Sylvania in the late 60s early 70s.

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[–] • 1 pt

Could be something like a Photomultiplier tube - for low light situations.

[–] • 0 pt

I believe it was supposed to look at the scintillation crystal I posted a few days ago.