The case, in 18kt white or rose gold, measures 41mm x 11.8mm. It has double AR-coated sapphire crystals.
Movement is the German manual-wind Grossmann in-house caliber 100.3 with 26 jewels (3 in screwed gold chatons) 18,000 vph and a power reserve of 42 hours. Adjusted to five positions. It features a lever escapement, shock-resistant Grossmann balance with 4 inertia and 2 poising screws, a Nivarox 1 balance spring with No. 80 Breguet terminal curve with Gerstenberger geometry. Functions are: hours and minutes, subsidiary seconds with stop seconds, date display, and Grossmann manual winder with pusher.
Special features include a Grossmann balance; handsetting 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 handsetting.
On the solid-silver dial, the minute scale is shifted inward to provide space for the complete date scale from 1 to 31. The blue date numerals contrast against the applied hour markers. To avoid competition with the hour and minute hands, the date indicator points to the date from the circumference instead of from the center. Finished by hand, the bracket-shaped date marker is annealed to a brown-violet hue to contrast against the blue date numerals. The Atume Date is fitted with lancet-style hands. They are crafted, finished, and annealed to a brown hue to match the rose-gold case. For the white-gold model, all hands are made of polished stainless steel.
It comes on a black or brown hand-stitched alligator leather strap with prong buckle in 18kt white or rose gold.
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