Elka x Ace Limited Edition - DIVERSITY SERIES / HEBREW ELKA X-14 The Ace Jewelers x Elka Watch Company Diversity Series is the result of a friendship between Alon Ben Joseph of Ace Jewelers and Hakim El Kadiri of ELKA Watch Company. The collection consists of four watches, each using a different type of numerals on the dial. The watches are powered by a La Joux Perret G100 self-winding movement with a power reserve of 68 hours. Production for each version is limited to just 25 pieces.