Franck Muller is a luxury Swiss watch brand founded in 1991 by the master watchmaker Franck Muller and the watch case maker Vartan Sirmakes. The brand is renowned for its innovative designs and complex mechanical movements, and is often referred to as the "Master of Complications". Franck Muller's timepieces are highly sought after by watch enthusiasts and collectors, and are considered to be among the most prestigious and exclusive watches in the world.