Linux Tux Micro
This geocoin doesn't really have anything to do with geocaching, other than being a geocoin that can travel in the game, so that's good enough for me. This is a Czech effort, and the official name of the geocoin is "Tux". If you head over to the website advertised on the reverse, you get a white page with the words "It works!" and that's it. (At least that is what I am seeing in December 2012.) I have no idea what it all means.
Size: 22 x 25 mm