  Sphere. 
Described as a beryllium gyroscope sphere from a military aircraft.  It's definitely not one of the classic light-weight gyroscope spheres: It appears to be solid, though of course still very light. No idea what it was really used for. 
Source: eBay seller ohioidustrialsurplus 
Contributor: Theodore Gray 
Acquired: 10 January, 2006 
Text Updated: 20 February, 2006 
Price: $66 
Size: 1.25" 
Purity: 99%
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