  Anode button.
Purchased from Neil Lipson (Lipson@postoffice.att.net) after contact through eBay. I'm very unclear on what process this odd item was a result of, but clearly electro-accumulation is a reasonable claim. It's quite peculiar. I have a pound of very similar buttons made of nickel instead.
Source: Neil Lipson
Contributor: Theodore Gray
Acquired: 29 May, 2002
Price: $5
Size: 1.25"
Purity: >99%
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