German watchmaker Moritz Grossmann presents the ATUM Power Reserve, a combination of the ATUM model family with the calibre 100.2 movement. The power-reserve complication constitutes a prominent accent in the perfectly reduced overall appearance of the watch. Its crisply drawn minute scale and the delicately pointed, manually sculpted hands are reminiscent of 19th-century precision measuring instruments. At the same time, the two-colour bar-shaped display in the dial is a reminder that the ATUM Power Reserve is a modern manifestation of pure watchmaking artistry.
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
Movement dimensions - Diameter: 36.4 mm, height: 5.4 mm
Grossmann balance; lateral pusher for disabling the hand-setting mode and starting the movement; bar-shaped power-reserve indicator with two-coloured display segment driven by a planetary gearing system; 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 hand-setting
Hours and minutes, subsidiary seconds with stop seconds, Grossmann winder with pusher, power-reserve indicator
Crown in 750/000 gold to wind the watch and set the time, pusher in 750/000 gold to start the movement
Three-part, precious metal
Diameter: 41.0 mm, height: 11.65 mm
Crystal/display back: Sapphire crystal, antireflection-coated on one side
Solid silver, hour markers in solid gold
Hands: Hand-crafted, steel or stainless steel
Hand-stitched alligator strap with pin buckle in precious metal
Case: 750/000 rose gold
Hands: Hand-crafted, steel annealed to a brown hue
Case: 750/000 white gold
Hands: Hand-crafted, hour and minute polished stainless steel, seconds steel annealed to a brown hue
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