====== 1915 ====== * [[Breitling, Gaston|Gaston Breitling]], son of [[Breitling]] founder [[Breitling, Léon|Léon Breitling]], developes the first wrist [[chronograph]]. * [[Patek Philippe]] produces its first [[complicated]] watch, a ladies [[repeater|5-minute repeater]] in platinum. * [[Tissot]] starts the production of wristwatches. * After England has fixed high import duties on watches, [[Rolex]] relocates its headquarters from London to [[Biel]]/Bienne (Switzerland) and [[1920]] to [[Geneva]]. <- [[1914]] | [[1916]] -> {{tag>Year}}