Reduction meets precision
The ATUM Power Reserve gives the model family a new face. The power-reserve complication constitutes a prominent accent in the perfectly reduced overall appearance of the timepiece, making it a modern manifestation of pure watchmaking artistry.
The bi-colour bar-shaped display in the dial complements the pure aesthetics and class of the chamfered hour markers and manually sculpted lancet-style hands. This model melds timeless elegance, horological innovation, and the accuracy of Grossmann’s 19th-century precision measuring instruments.
The small power-reserve complication was developed to meet the exceptionally stringent requirements imposed on precision measuring instruments such as marine chronometers. This prominent detail of modern manually wound watches identifies them as manifestations of high-end horology.
The balanced face of the ATUM Power Reserve is characterised by its manually sculpted, lancet-shaped hands that move along a crisply drawn minute scale. On the side of the case with the strikingly filigreed bezel, the pusher beneath the crown is the signature element of the Grossmann winder. Thanks to the power-reserve indicator, the delightful experience of operating the unusually smooth handsetting train may become a less frequent one. After all, the progressively red segment automatically prompts the use of the manual winder long before the movement stands still. And incidentally, the bicolour display of the ATUM Power Reserve is a visible hallmark of pure watchmaking artistry.
Case: 750/000 white gold
Hands: Hand-crafted, steel, annealed to a brown hue
Movement: Manufacture calibre 100.2, manually wound, adjusted in five positions
No. of parts: 227
No. of jewels: 26 jewels, 3 of which in screwed gold chatons
Escapement: Lever escapement
Oscillator: Shock-absorbed Grossmann balance with 4 inertia and 2 poising screws, Nivarox 1 balance spring with No. 80 Breguet terminal curve, Gerstenberger geometry
Balance: Diameter 14.2 mm, frequency 18,000 semi-oscillations per hour
Power reserve: 42 hours when fully wound
Functions: Hours and minutes, subsidiary seconds with stop seconds, Grossmann winder with pusher, power reserve indicator
Special features: Grossmann balance; lateral pusher for disabling the handsetting mode and starting the movement; space saving and modified Glashütte stopwork with backlash; adjustment with Grossmann micrometer screw on a cantilevered balance cock; Pillar movement with 2/3 plate and frame pillars in untreated German silver; 2/3 plate, balance cock, and escape-wheel cock engraved by hand; broad horizontal Glashütte ribbing; 3-band snailing on the ratchet wheel; raised gold chatons with pan-head screws; separately removable clutch winder; stop seconds for handsetting
Operating elements: Crown in 750/000 gold to wind the watch and set the time, pusher in 750/000 gold to start the movement
Case dimensions: Diameter: 41.0 mm, height: 11.65 mm
Movement dimensions: Diameter: 36.4 mm, height: 5.4 mm
Case: Three-part, precious metal
Dial: Solid silver, hour markers in solid gold
Hands: Hand-crafted, steel or stainless steel
Crystal/display back: Sapphire crystal, antireflection-coated on one side
Strap: Hand-stitched alligator strap with pin buckle in white gold