Sunday, August 7, 2016

Moritz Grossmann ATUM Pure

Unveiled at Basel world 2016, the ATUM Pure re-invents the Pure Classic Finish, a classic horology technique mastered by Moritz Grossmann, the inspirational founder of the watch manufacturing company.

The Pure Classic Finish is another historic facet that Grossmann is bringing to life: Moritz Grossmann applied various finishes to his chronograph movements, thus changing their looks. In highly diverse variations, they also reflect different concepts. Grossmann is now pursuing this tradition with a second finissage approach: The Pure Classic Finish focuses on horological details in design and craftsmanship. It concentrates on function and on the aesthetic appeal of materials. Two specially conceived manufacture calibre stands out in the new steel versions of the ATUM. Combining cool steel and puristic reduction, the ATUM Pure, embodies Grossmann's philosophy in perfection.
From the outside, the ATUM Pure is nearly unchanged. The steel case underscores the technical nature of the model family. Its dial is endowed with a fine brushed texture and is lacquered in white, grey, or blue. Burnished chamfers on the seconds dial and along the applied markers amplify the sporty nature of the watch. With their straight edges and broad chamfers, the lancet-shaped hands match the marker style. They are hand sculpted from stainless steel, a modern material that retains its toughness after tempering. After their openings are filled with white "Hy-Ceram", the hands are meticulously polished to attain their final look.
A glance through the display back reveals the calibre 201.0 with the Pure Classic Finish. It was specially designed to be cased in stainless steel. The German silver plates are shot-peened with glass beads for enhanced aesthetic appeal. Shot peening matts the surface, making it highly sensitive. Great care must be taken in the assembly phase for this reason. The white sapphire bearing jewels, a Grossmann hallmark, are pressed directly into the plate. The movement screws are polished flat and retain their original steel hue.
The calibre 201.0 movement embodies some of the manufacture's most prominent proprietary developments such as the Grossmann balance, the modified Glashütte stopwork, and the Grossman manual winder with pusher. The characteristic Grossmann balance is paired with a hand-shaped flat hairspring that has two bends. Because the curb pin remains free, the adjuster curve can be accurately centred. Design modifications make it possible to adjust beat and rate separately without removing the oscillator. For this purpose, Grossmann's watchmakers positioned the rotatable stud holder in the balance cock such that it can be conveniently blocked. There is absolutely no play between the index adjuster, the stud holder, and the upper balance bearing. This allows the ATUM Pure to be precisely adjusted at any time.
The ATUM Pure comes with white, grey, and blue dials. All three versions are limited 150-watch editions.

Technical details

Movement   
Manufacture calibre 201.0, manually wound, adjusted in five positions
Diameter: 36.4 mm, height: 5.0 mm
No. of parts: 187
Jewels: 20
Escapement: Lever escapement
Oscillator: Shock-resistant Grossmann balance with 4 inertia and 2 poising screws, Nivarox 1 balance spring
Balance: Diameter 14.2 mm, frequency 18,000 semi-oscillations per hour
Power reserve: 42 hours when fully wound
Features: Grossmann balance; handsetting override and start of movement with lateral pusher; space-saving 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; separately removable clutch winding mechanism; stop seconds for handsetting

Functions   
Hours and minutes, subsidiary seconds with stop seconds, Grossmann manual winder with pusher

Operating elements    
Crown for winding the watch and setting the time, pusher to start movement

Case
Three-part, stainless steel
Diameter: 41.0 mm, height: 11.35 mm
Crystal and display back: Sapphire crystal, antireflective coating on one side

Dial    
Brass rhodiumed, hour markers stainless steel, rhodiumed
Hands: Hand-crafted, hour and minute stainless steel, polished, with white HyCeram filling, subsidiary second stainless steel

Strap
Hand-stitched alligator strap with prong buckle in stainless steel

Versions
Reference: MG02.I-04-A000499 - Dial: Blue; Limitation: 150 watches
Reference: MG02.I-04-A000502 - Dial: Grey; Limitation: 150 watches
Reference: MG02.I-04-A000496 - Dial; White; Limitation: 150 watches

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