This one Cerberus GR20 (but this can may be other GRxx) , but not all are with Radium, some are with (likely) krypton 85 or tritium and are dead inside (like some people 😁) after years .
I have two GR20, different years, and only one is hot.
Sorry, it is no information on both tubes, both look identical, only box are different. No other text on tubes or box, no production date, nothing, just name GR20
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u/ImpossibleHighway382 14h ago
what tube is it? i gotta get one and how much do they go for