Just a couple of days ago I found my dads old watch that he got in the late 1990s. With the help of the Watches subreddit I think we narrowed it down to having Tritium. Seems to be too new to have radium but doesn't really fit the characteristics of the non radioactive glow in the dark stuff. 

It doesn't glow in the dark on its own anymore, it does get very bright when I put a flashlight up to it but only lasts a couple minutes. 

The glass does seem to have a crack in it but its still intact. My main concern is the dust surrounding the watch. Obviously when I lifted it I shook off the dust without ever knowing it was glow in the dark. I used to play around with the watch when I younger like 10 years ago and never knew...

Anyways, should I be concerned about this? I can't see any glow at night which would make sense since the half life is like 12 years and we've had the watch for at least 23 years. Maybe it barely has a glow but I don't wanna stick my face in it to make sure.

Should I be worried about the surrounding dust? Is the watch general safe as long as I don't break it open? Should I get rid of it?

Im really freaking out over this and need some reassurance.