True works of art are unique. The ATUM Skeleton is a work of art. None other than Christophe Schaffo, the acclaimed master of the genre, created this aesthetically skeletonised watch. Indeed, the ATUM Skeleton is one-of-a-kind. Grossmann is presenting the one and only exemplar of this signed watch.

ATUM Skeleton


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ATUM Skeleton


manually wound, adjusted in five positions

No. of parts

198, Manufacture calibre 100.5 (sceletonized calibre 100.1)

No. of jewels

20, of which 3 in screwed gold chatons


Lever escapement

Oscillation system

Gustav Gerstenberger geometry, Nivarox 1 balance spring, Shock-resistant Grossmann balance with 4 inertia and 2 poising screws, with No. 80 Breguet terminal curve


Diameter: 14.2 mm, Frequency: 18,000 semi-oscillations per hour

Power reserve

42 hours when fully wound

Operating elements

crown for winding the watch and setting the time, pusher to start the movement


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


750/000 gold, three part

Case Dimensions

Diameter: 41.0 mm, height: 11.35 mm

Movement dimensions

Diameter: 36.4 mm, height: 5.0 mm




annealed to a brown or brown-violett hue, Hand-crafted, polished steel

Glass and Caseback

Sapphire crystal, antireflective coating on one side

Special Features

Grossmann balance, Grossmann manual winder with pusher for uncoupling the handsetting mode and restarting 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 hand-engraved, 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


alligator leather, hand-stiched

Strap color

Black, Dark Brown


Butterfly Clasp