A work of art by two masters

ATUM Schaffo


Moritz Grossmann, the independent Glashütte watchmaker, will celebrate its 10th anniversary next month. As part of the celebration, the company will present The ATUM ‘Schaffo’ skeleton, a one-off piece created in collaboration with iconic Swiss watchmaker and designer, Christophe Schaffo.

Moritz Grossmann formulated the ideal of “designing a simple but mechanically perfect watch” in the 19th century. With the ATUM ‘Schaffo’, the functionality and beauty of the mechanism are apparent at first sight. The dial consists of an elegant, narrow ribbon of rhodium-plated German silver featuring the minute markers, revealing the exquisitely finished movement, where each component has been chamfered, chased and engraved by hand.

Every movement of the dial train, balance wheel and other parts of the mechanism demonstrates the artistry and technique that went into making this timepiece. Blackened stainless steel is used for the case, winding crown and pusher which — along with the black alligator leather strap — form a stunning contrast to the dial. Schaffo’s artistic creativity, technique and craftsmanship are outstanding and renowned around the world. He painstakingly stamped, cut and milled to minimise the material used for the calibre 100.5 in the ATUM ‘Schaffo’. The result is a masterpiece of skeletonisation.

The Moritz Grossmann brand manufactures timepieces to the highest standard of craftsmanship under the tagline “Schönstes deutsches Handwerk”. The ATUM ‘Schaffo’ brings together the craftsmanship of two masters — the Swiss artist Christophe Schaffo and the German watchmaking pioneer Moritz Grossmann. The one-off watch includes the name C. Schaffo on the ratched wheel and is a single edition 1 of 1.

Tech Specs


Manufacture calibre 100.5, manually wound, adjusted in five positions

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 sceletonized plate and frame pillars in rhodium plated German silver; ratchet wheel with the name C. Schaffo on it; raised gold chatons with pan-head screws; separately removable clutch winder; stop seconds for handsetting


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

No. of parts


No. of jewels

20 jewels, 3 of which in screwed gold chatons


Lever escapement


Shock-resistant Grossmann balance with 4 inertia and 2 poising screws, Nivarox 1 balance spring


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 movement

Case dimensions

Diameter: 41.0 mm, height: 11.35 mm

Movement dimensions

Diameter: 36.4 mm, height: 5.0 mm


Three-part, stainless steel black


Hand-crafted, steel annealed to a brown violett hue

Crystal / display back

Sapphire crystal, antireflection-coated on one side


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

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ATUM Schaffo

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