Moritz Grossmann ATUM Date All Blue

Celebrating their 10th anniversary, independent Glashütte watchmaker Moritz Grossmann is presenting their third unique piece, the ATUM Date All Blue.

As with all Moritz Grossmann watches, the ATUM Date All Blue combines clear design with first-rate technology. Issued as a one-off as a variant on the ATUM Date, the watch is a fine example of integrated date setting technology alongside beautiful craftsmanship.

In addition to the accurate jumping date display, the date can be corrected forwards and backwards at any time, up to less than one second before and after midnight. A separate locking crown at “10 o’clock” allows the date to be set by turning in both directions, forwards and backwards, without having to stop the movement.

With the ATUM Date All Blue, the silver dial harmonises with the blue hands and a blue date window. Continuing the theme, the watch uses blued steel screws, a rare variation on the otherwise predominantly brown-violet annealed screws at Grossmann. The ATUM Date all Blue is offered with the calibre 100.3 in the high-artistic finish as a blue single edition 1 of 1.

Technical details

Movement
Manufacture calibre 100.3, manually wound, adjusted in five positions
Diameter: 36.4 mm, height: 5.55 mm
No. of parts: 259
No. of jewels: 26, of which 3 in screwed gold chatons
Escapement: Lever escapement
Oscillator: Shock-resistant Grossmann balance with 4 inertia and 2 poising screws, Nivarox 1 balance spring with No. 80 Breguet terminal curve, Gustav 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, date display, Grossmann manual winder with pusher

Operating elements
Two crowns in 750/000 white gold to wind the watch and set the time and the date, pusher in 750/000 white gold to start the watch

Special features
Grossmann balance; hand setting override and start of movement with lateral pusher; precisely jumping date display with a peripheral marker; bidirectional date adjustment with a separate crown at 10 o’clock; space-saving modified Glashütte stopwork with backlash; adjustment with Grossmann micrometer screw on cantilevered balance cock; pillar movement with 2/3 plate and pillars made of untreated German silver; 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 winding mechanism; stop seconds for hand setting

Case
Three-part, precious white gold
Diameter: 41.0 mm, height: 11.85 mm
Crystal and display back: Sapphire crystal, antireflective coating on one side

Dial
Solid silver, hour markers in white gold
Hands: Manually crafted, in steel or stainless steel

Strap
Hand-stitched alligator strap with prong buckle in precious metal

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