Named after the molecular formula for nitroglycerine, the C3H5N3O9 Experiment ZR012 Watch (110,000 CHF; roughly $118,000) certainly qualifies as experimental. Created in a partnership between MB&F and URWERK, the C3H5N3O9 — aka Nitro — features a Wankel engine-inspired display with separate triangular-shaped rotors to indicate hours and minutes, a zirconium case, and articulated rear lugs that make the relatively large timepiece sit well on nearly any sized wrist.
There are plenty of rare watches out there, but few are literally one-of-a-kind. Created for the Only Watch auction in 2011, this Louis Vuitton Tambour Diving Watch ($TBA; Auction) is crafted from 18K black gold, and features a black and orange design, a square button chronograph, counter, date, and an orange rubber strap. It comes encased in a custom Damier Graphite canvas presentation trunk, and includes additional black and orange alligator straps, as well as a certificate of authenticity.
Built to commemorate the 50th anniversary of a Heuer watch's first trip into space — aboard the wrist of John Glenn — the TAG Heuer Carrera 1887 SpaceX Watch ($5,800) pays tribute while looking to the future. It's based on the stanard 1887 Carrera, and features an in-house caliber 1887 movement, a white dial with custom anthracite hands and hour markings, a polished stainless steel case, a brown perforated leather strap, and a smoked-sapphire case back with the SpaceX logo and an illustration of the company's Falcon rocket and Dragon spacecraft. Limited to 2012 individually-numbered examples. [via]