Pretty little ingot. 
This is a small bar of zinc that was clearly meant to be some kind of commemorative or advertising item, presumably for the Bunker Hill company/mine/town/whatever.  The surface has been etched to bring out the crystal patterns, and it has little felt feet on it.  Obviously a bar meant to be appreciated, not melted down.  It's fairly high purity for zinc, if we believe the 99.99 molded in it. 
Source: eBay seller markbritt 
Contributor: Theodore Gray 
Acquired: 16 August, 2004 
Price: $6.50 
Size: 4" 
Purity: 99.99%
 |  
  |  
 |  
  |