Diashock is a shock-resistance device. When a watch is subject to shock, as when it is dropped on a hard floor, the component most likely to be damaged is the balance staff, which is the balance wheel’s rotation axis. Even compared to other movement parts, the balance staff is extremely thin, being only between 0.07 to 0.08 mm in diameter, or about the same as a human hair. Protection from shock is therefore crucial and the Seiko solution was to create Diashock, a device that protects the balance wheel from shock and vibration. The jewel anchoring the balance staff is attached to a hairspring and, when the balance staff is subjected to a strong shock, the elasticity of that hairspring absorbs it.
A Seiko invention in 1959, the Magic Lever greatly increases the winding efficiency of a watch and shortens the time needed for the main spring to become fully wound. This ingenious V-shaped lever allows all the energy generated by the oscillating weight’s motion, whether clockwise or anti-clockwise, to be transferred to the main spring. It is effective, simple and durable and contributes significantly to the longevity of the watch. The Magic Lever system has now been adopted by leading watchmakers throughout the world.
Utilized in all our mechanical watches, Spron mainspring and hairspring alloys are exclusive to Seiko watches. Spron features superior elasticity, strength, and corrosion and heat resistance. The Spron family of alloys was originally developed jointly with the Metal Materials Laboratory of Tohoku University and, today, the high performance characteristics of Spron have led to its use in a wide range of fields, from electronics to medicine.
Sapphire crystal with super clear coating
Seiko’s proprietary anti-reflective coating, applied on both the front and back of the glass, prevents 99% of light reflection and ensures that the dial is easily legible, even in bright light.
Soft leather for a comfortable fit with a luxurious feel.