Show sample as: 72-frame QuickTime VR or 360-frame QuickTime movie loop.    My periodic table poster is now available! Old germanium diode. Very pretty old germanium crystal diode. Source: eBay seller 7538bruce Contributor: Theodore Gray Acquired: 17 April, 2008 Text Updated: 18 October, 2009 Price: $2.50 Size: 0.2" Purity: 99.99%