Atum, the god of creation in ancient Egyptian mythology, is the eponymous figure after whom the second watch line of the young manufacture in Glashutte has been named. The manually wound A TUM epitomises mature technology and the ultimate in manufacturing perfection. It is a manifestation of time in the form of precious materials and traditional craftsmanship.
The superb functionality of the ATUM is reflected in its subtly balanced aesthetic appeal.
The movement is embedded in a three-part precious-metal case with a slender bezel. The applied markers with polished chamfers clearly contrast against the solid-silver dial. The subsidiary seconds dial above the "6" is recessed, so that the hands can hover tightly over the crisply defined minute scale.
The hands are manually fashioned in the manufacture - a rare artisanal process in modern watchmaking -and are endowed with a lance shape as well as broad chamfers to match the three-dimensionality of the hour markers. Each hand is meticulously tempered and ground to achieve a sharp, elongated tip. The colour of the hands is chosen in the interest of maximum contrast against the base colour of the dial: Shiny stainless steel hands match the dark dials while flame-annealed steel hands are the perfect complement for all brighter dials. Brown, an unusual colour for steel, is the result of a carefully timed annealing process that needs to be stopped with one-second accuracy.
Several innovations in the movement of the ATUM are noteworthy m the ways they optimise its user-friendliness and functional reliability.
- The Grossmann balance, a newly conceived oscillator, is crafted inhouse in its entirety.
- The manual Grossmann winder with pusher incorporates a perfected handsetting mechanism.
- And the remodified Glashutte stopwork allows the components to be flexibly configured.
Calibre 100.1 movement
The calibre 100.1 movement of the ATUM can be admired through the ample, nonreflective sapphire-crystal display back. Subtly proportioned components in untreated German silver with different types of finissage constitute the individual levels of the pillar movement. The signature is hand-engraved into the characteristic 2/3 plate decorated with wide horizontal ribbing. The circular cutout of the plate reveals the new Grossmann balance for the first time. It is carried by the cantilevered, hand-engraved balance cock with the typical micrometer screw. The ATUM also embodies all the hallmarks and underlying values of a classically crafted timepiece signed MORITZ GROSSMANN GLASHUTTE I/SA.
- Pillar movement with 2/3 plate and frame pillars in untreated German silver Hand-engraved 2/3 plate, balance cock, and escape-wheel cock
- Wide horizontal Glashiitte ribbing on the 2/3 plate
- Adjustment with Grossmann micrometer screw on a cantilevered balance cock
- Remodified Glashiitte stopwork with backlash
- Separately removable clutch winder
- White sapphire jewels in raised gold chatons with brown-violet pan-head screws
- 3-band snailing on the ratchet wheel
The Grossmann balance
The calibre 100.1 movement IS the first to incorporate the newly designed oscillator. Optimised for artisanal manufacturing techniques, the ingenious design of the Grossmann balance improves the adjustability of inertia and achieves high kinetic energy combined with minimised air resistance and the smallest possible mass. The number of screws in the balance wheel rim was minimised, and the bores in the rim are equidistant. This makes it possible to vary the moment of inertia by inserting mass screws with different head lengths in the bores. The smooth cylindrical balance staff is integrated in the hub and can easily be replaced if necessary. The Grossmann balance is paired with a Nivarox 1 balance spring that is overcoiled with a quarter arc on the inside and secured to the slotted roller with a brass pin.
The manual Grossmann winder with pusher
The watchmakers at Grossmann addressed the requirements imposed on a manually wound watch by focusing on improved convenience and greater functional reliability. The Grossmann winder with pusher features a refined handsetting mechanism that eliminates two possible error sources: the ingress of particles into the case while the hands are being set and the unintentional alteration of the hand positions while the crown is being pushed home again.
When the user briefly pulls the winding crown out, the winder switches to the handsetting mode and simultaneously stops the movement. The crown immediately returns to its home position but can now be turned to precisely set the hands. Afterwards, the movement is restarted with the pusher adjacent to the winding crown without altering the positions of the hands. At the same time, the mechanism switches back to the winding mode.
A modified Glashutte stopwork secures the tension of the mainspring. After winding, it allows the ratchet wheel to reverse somewhat and slightly relax the mainspring. With the launch of the calibre 100.1 movement in the ATUM, Grossmann's watchmakers introduced an optimised, space-saving variation of this recoil. The stop click sits on a lever that pivots about the centre of the mainspring barrel and accommodates the backlash stroke.
Myths of creation
The Ennead of Heliopolis is one of the oldest stories in ancient Egyptian mythology about the inception of the world. The nine deities are revered in Heliopolis, where the Bennu incarnated on earth as the first living being. The god Atum is the origin of the nine. Selfbegotten from nothing, he represents the genesis of everything. Atum is the cosmos, matter, and the complete one; through his progeny, he is the finisher of the world. With his creative powers, Atum engendered air and moisture, the heavens and the earth, and time. The mythos of time is as fascinating as the enigmatic mythology of creation. And the god of creation inspired the second model line of the Grossmann manufacture, which now bears the name ATUM.
Movement Manufacture calibre 100.1, manually wound, adjusted in five positions
No. of parts 198
No. of jewels 20 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
- Grossmann balance;
- lateral pusher for disabling the h andsetting mode and starting the movement;
- space saving and modified Glashtitte 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 Glashtitte 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: 11.35 mm
Movement dimensions Diameter: 36.4 mm, height: 5.0 mm
Case Three-part, precious metal
Dial Solid silver, hour markers in solid silver
Hands Hand-crafted , steel or stainless steel
Crystal/Display back Sapphire cryst al, antire fle ct ion-coated on on e side
Strap Hand-stit ch ed a lligator strap with butterfly clasp in precious metal