AutomaticThe self-winding movement boasts a power reserve of 92 hours and is housed in a sporty stainless steel case that offers fascinating insights through its water-resistant transparent caseback.
- Material: Stainless steel with crocodile skin strap
- Movement: Self-winding manufacture caliber CW4 with eccentrically placed self-winding rotor
- Diameter: 41 mm
- Special features: 92-hour power reserve
- Wempe reference: WG090002
Perfection on 41 millimeters
“All good things come in threes”: this adage also applies to Wempe Chronometerwerke, which boasts three exclusive hand-wound movements for wristwatches. Tonneau- shaped Calibers CW1 and CW2 meanwhile belong to history, but round Caliber CW3 continues the tradition. Automatic movements joined the family in 2016: when a watch powered by an automatic caliber is worn, a heavy metal rotor continually supplies fresh energy to its movement. An alternating gear train efficiently takes that energy and winds the movement’s two mainsprings in both directions of rotation. The relatively small oscillating weight makes its revolutions above a typical Glashütte three-quarter plate; the rotor is borne atop tiny ceramic balls, which ensure longevity and uncomplicated servicing. More than 96 hours of autonomous energy are guaranteed after the rotor has fully tensioned both mainsprings, so this microcosm will still be ticking at a reliable and certified pace of four Hertz even after it has spent a long weekend inside a safe. A handsome elongated bridge, engraved by hand in accord with time-honored Glashütte tradition, hovers above the variable-inertia balance. A traditional index mechanism for fine adjustments to the rate is unnecessary because four screws in the balance wheel facilitate this for the watchmaker. The balance can be halted to exactly synchronize a time signal and the second hand, which sweeps from the dial’s center. The Wempe Chronometerwerke movement delights the eye with five gold chatons, while endstones limiting the vertical play of the fourth wheel represent another quality characteristic of automatic Caliber CW4, which was developed in collaboration with the specialists at Manufacture Horlogère Vallée de Joux S. A. (MHVJ) in Switzerland. Ultramodern manufacturing centers in the Müglitz Valley are responsible for the three-quarter plate and the balance, the automatic subassembly, and the center wheel bridges. Assembly of the caliber’s 300-plus components, its fine adjustment, and its encasing – in a 41 mm case with transparent case back water-resistant to three bar – as well as the chronometer tests according to the DIN 8319 norm, all take place in Glashütte.