Like new Accuracy First 34mm bubble level with the glow in the dark vial installed. This was on a fun for one range trip and switched to a LR Send It Level.
Tritium's halflife is approximately 12 years. So it will be half as bright as it was when new after 12 years time, then half again as bright after another 12, and so on.
First one is back up for sale, second inbound. @BAO13 and @KentuckyRifle. Get them. I should have he second this afternoon and will send @KentuckyRifle a PM when I have pics and price.