In 2008, Landsharkz offered the Geoguitar series of geocoins. This was a group project, where individual geocachers could customize a guitar geocoin, with the caching name on the back.
I think there were 50 or more cachers participating, but in the end I only managed to trade for five other personal geoguitars. (And I still have a pile of my own.)
In addition to the personal geoguitars, Landsharkz also issued three special country geoguitars (Canada, USA, and UK). This is the British Invasion geoguitar.
Size: 82 x 28 mm