So far, highlights such as the Grossmann balance, the hand-engra-
ved balance cock or the ratchet wheel with three-band snailing
could only be admired through the display back. Now, with the
development of the mirrored calibre, they can be shown on the dial
side. This ATUM model presents the “back page” of the movement
in an unusually large dial aperture that doubles as a prominent
stage.

ATUM Backpage

38.400,00 46.800,00 

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Details

Version

ATUM Backpage

Movement

manually wound, adjusted in five positions

No. of parts

230

No. of jewels

24, of which 7 in screwed gold chatons

Escapement

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

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, Grossmann manual winder with pusher

Case

platinum, rose gold

Case Dimensions

Diameter: 41.0 mm, height: 11.35 mm

Movement dimensions

Diameter: 36.4 mm, height: 5.0 mm

Dial

solid silver

Hands

Hand-crafted, steel or stainless steel

Glass and Caseback

Sapphire crystal, antireflective coating on one side

Special Features

Grossmann manual winder with pusher for uncoupling the handsetting mode and restarting the movement, pillar movement with 2/3 plate and frame pillars in untreated German silver, ARCAP train wheels, balance staff with integrated safety roller, flat balance spring, impulse pin attached to rim, shock-resistant balance with inertia and poising screws

Strap

alligator leather, hand-stiched

Closer

Prong buckle