Sinn watch 756 diapal leather sinn watches developed its diapal technology in order to have a lubrication free escapement mechanism the lack of a lubricant inside the movement ensures the accuracy of the watch in the long run this 756 diapal watch is equipped with valjoux 7750 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels the case is hardened through the use of sinns tegiment technology a dehumidifying capsule protects the dial from fogging another ex