Seiko SRPE17 Presage Automatic Dress Watch with 40.5mm Case

From the Presage Cocktail Time Collection

Fine mechanical watchmaking from Japan

Manual and automatic winding capabilities

21600 vibrations per hour

Power reserve: approximately 41 hours

23 jewels

Black dial with pressed pattern and gloss finish

Date calendar

Box-shaped crystal

Screwdown see-through caseback

Case diameter: 40.5mm

Stainless steel case and bracelet

Double deployment clasp with push button release

Water-resistant to 5 bar 50 meters (165 feet)

The Presage series Seiko SRPE17 (known colloquially as "Cocktail Time") is powered by the 23-jewel Seiko 4R35 self-winding movement that can also be hand wound and hacked. The case has a polished finish and a radiant black textured dial with silvertone hands and hour markers. A date display is shown at the 3 o'clock position. The stainless steel bracelet has a butterfly-style deployant clasp for easy on and off. A scratch resistant Hardlex crystal is used along with an exhibition back that allows you to view the movement in action. Water resistant to 50 meters.

Diashock

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 pivot which is the balance wheels rotation axis. Even compared to other movement parts this part is extremely thin being only between 0.07 to 0.08mm 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 absorbs impact on one of the most vulnerable parts of the mechanical watch the balance-staff pivot. Diashock also reduces friction to ensure optimum amplitude of the balance wheel.

Magic Lever

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 weights 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.

Spron

Utilized in Presage 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.