Here is a (growing) comprehensive list of all the one-of-a-kind watches made and donated by brands to the 2011 edition of the Only Watch charity auction to be held in Monaco in September. As of writing there are 34 participating Only Watch 2011 brands that will offer a piece for auction. The below list will be updated as new information comes in. The names of the piece are under the image of that respective piece.
Celsius X VI II LeDIX GMT Big Date Mobile Phone Only Watch 2011
Breguet Maestro Only Watch 2011