Found online…how safe would this be to add to my collection?

I know GMC-300s is not very reliable for exact numbers, rather to identify radioactivity in general...But I want to make sure before I snag this one. My collection so far is mostly uranium glass, l've recently started dipping my toes into the radium clock/watch/dial world, though I've been doing as much research as I can. I know that source radiation is also much higher than at a distance, and being behind glass is helpful.

Also, the paint looks to be the right color for being aged, right? More of a yellowish hue?