This coin was created for the first Calgary Maker Faire on Sept 8th, 2012. It is intended on being printed and given away as a free token of the event.
The *noback.stl version of the file has just a plain back. Whereas the main file has the front image sort of etched into the back.
Print lots of either, and give away at MFYYC 2012!
(It was decided not to date or brand the coin so it could be possibly reused for other things.)