For the rectangular shape, the new calibre 102.3 was developed, which makes optimum use of the installation space for the movement and also offers further advanta-ges. It has resulted in a movement with a relatively large barrel.
The characteristic stop-second function has been rea-lised in a new form.

The kinetic energy of the angle lever is transmitted via a coupling rod, whereby the balance is gently braked by means of the stop spring and comes to a precise standstill.
The entire construction of the movement was designed to realise the time display with a central hour and minute hand, as well as a small second at 6 o’clock.


High Artistic Finish

High Artistic Finish

The CORNER STONE is supplied with a movement in High Artistic Finish. The typical four Grossmann stripes are applied horizontally to the two thirds plate. The writing “Moritz Grossmann” is engraved by hand.

The ratchet wheel has a particularly elaborate surface finish in the form of three band snailing. For the resulting optical effect, the teeth of the ratchet are initially given a continuous bevel. The snailing is then traditionally applied with a bronze bell. Turning the ratchet wheel creates an optical illusion: the rotation of the wheel when winding the watch is no longer perceptible.

The stepped balance cock with hand-engraved pattern, the golden chatons and the manually crafted hands tempered over an open flame perfect the extremely sophisticated impression of this watch.

Tech Specs


Manufactory calibre 102.3, manual winding, regulated in five positions

Special features

Grossmann balance; 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


Hour and minute, small second with stop seconds

No. of parts



Lever escapement

Oscillation system

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


Diameter: 10.0 mm, frequency: 21,600 semi-oscillations per hour

Power reserve

60 hours when fully wound

Movement dimensions

30.0 mm (length) x 20.0 mm (width) x 3.6 mm (height)

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