A little more off the beaten path, OMEGA released a limited edition Speedmaster Mark II in 2014 to commemorate the 2016 Rio de Janeiro Games. This link is my personal favorite OMEGA × Olympic watch. It takes the funky and off-beat '70s aesthetic that the Mark II reissue (also released in 2014) excelled at, and adds in just a touch of esoteric Olympic spirit. Here, that takes the form of the sub-dial rings, each register is surrounded by an actual 18k yellow gold, 925 silver, or bronze ring.