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This is an antique spinthariscope: I'm not sure how old, but I would guess it's from the 1930s or so. Look a couple samples up for a longer discussion about spinthariscopes, which are amazing little gadgets. This one registers quite strongly on my Geiger counter, indicating it is probably made with real radium.
Source: eBay seller dahl1az
Contributor: Theodore Gray
Acquired: 10 March, 2004
Text Updated: 9 May, 2007
Price: $81
Size: 0.6"
Purity: <0.1%
Sample Group: Spinthariscopes