Graham-London traces its origins to London clockmaker George Graham (1673-1751) who is responsible for many innovations in timekeeping. He created the first stopwatch. He devised a mercury pendulum system for making clocks more accurate in very hot and very cold weather. He also built the master clock for Greenwich Royal Observatory which defined time for most of the 18th century. Graham-London was resurrected in 1995 by Eric Loth and is today a privately owned Anglo-Swiss watch company which design and builds its own watches in its La Chaux-de-Fonds production facilities in Switzerland.