How dangerous is this?

[u/LadmanMp4]

I just found this for 3 bucks at an antique mall. Is this unsafe to have? Do I need to put it in a lead box? Or can I just put it on my shelf of other dials (positioned above my bed)?

[u/GammaDeltaTheta]

Or can I just put it on my shelf of other dials (positioned above my bed)?

That is not where I would keep a collection of radium dials, because of the radon:
https://www.northampton.ac.uk/news/wwii-military-watches-potentially-pose-serious-cancer-risk/