Lemania 5100

Cal. 5100 is an automatic chronograph movement made by Lemania from 1974 to 2002. It operates at 28,800 vph with a 48-hour power reserve and 17 jewels. The movement features a central chronograph minutes hand and 24-hour hand, an arrangement that distinguished it from contemporaries like the Valjoux 7750. It was used by Omega, Sinn, and Tissot in their pilot and tool watches, and spawned several derivatives including the hand-winding Cal. 5200.