18k yellow gold open face split second chronograph, circa 1890, 44mm diameter pocket watch by Tiffany. Case, curvette, dial & movement signed by Tiffany, movement probably by Meylan. Clean porcelain dial with black Roman numerals, minute/seconds outer ring with 5 minute black Arabic numerals. Fine 18k yellow gold case and curvette. Split second chronograph movement in good working condition. An exceptional piece of workmanship.