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). The Canada geoguitar features Landsharkz' mascot Beaver Dude, aka Canadian Cacher.
Size: 82 x 28 mm