Epos was founded in 1925 by Jean Aubert, a former engineer of Valjoux and Landeron. Today, Epos is known for its in-house innovations, complications developed by the son-in law of the founder and watch engineer in chief, Jean Fillon. The Jumping hour, power reserve, big date and regulator complications have been constructed on base calibers from Unitas or Peseux. These complicated models have lavishly hand-decorated movements, with crystal display backs.