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3D3DSilver dollar sputtering target.
What a bizarre, yet perfectly sensible idea. This is a sputtering target, a disk of high-purity silver used in a machine that blasts the surface of the disk with high-energy electrons, knocking loose silver atoms which then travel through a vacuum to be deposed on something you want coated with silver (a mirror for example).
It's also quite obviously an American silver dollar coin, or at least used to be, as you can see from the remainder of the pattern on the surface. Why not? If it's the right size, and it's made of 99.9% (999 fine) silver, no reason it shouldn't work.
Source: Ethan Currens
Contributor: Theodore Gray
Acquired: 28 February, 2009
Text Updated: 1 March, 2009
Price: Confidential
Size: 2"
Purity: 99.9%