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3D3DAntique StaticMaster.
I don't remember where I got this from, but it's a old StaticMaster that expired in 1962 (you can see the date in the photograph). That means it was made in the late 1950's, since these polonium-based anti-static brushes have a rated life of a couple of years.
Source: Unknown
Contributor: Theodore Gray
Acquired: 3 July, 2007
Text Updated: 4 July, 2007
Price: Unknown
Size: 2.5"
Purity: <.01%