The 'Only One' by Richard Mille & Philippe Starck

Limited to an edition of one watch, this monstorous collaboration by Richard Mille and Philippe Starck was created exclusively for the 2005 'Only One' charity event in Monaco. Despite it's catchy name, "Automatic Unique Model 1 of 1", it auctioned for a record amount of €285,000.

See the other 34 one-of-a-kind models here-->Link

Features; 53mm 18k white gold case, spline screws for hour markers, automatic winding, manual rewinding, top & bottom sapphire crystals and transparent date wheel.