  Plumbing lead ingot. 
I bought this ingot in an Ace Hardware store a few years ago.  Lead is actually still used sometimes for joining old card iron drain pipes. 
Source: Hardware Store 
Contributor: Theodore Gray 
Acquired: 2 April, 2009 
Text Updated: 3 April, 2009 
Price: $10 
Size: 5" 
Purity: >98%
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