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XII Birthday Edition

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To mark the 12th anniversary of Grossmann Uhren GmbH in Glashütte I./ SA, the German manufactory for exquisitely crafted watches with perfect mechanisms is launching a new model on 11 November 2020. The model bears a special reference to Moritz Grossmann, the grand master of the art of watchmaking in Glashütte and namesake of the manufactory. The main focus is on the silver-plated by friction dial, a traditional finishing technique from the 19th century, which was also used by the gifted watchmaker Moritz Grossmann for his high-quality pendulum watches.

The new model comes in a limited edition of twelve pieces and bears the name ‘XII Birthday Edition’ – just six pieces in rose gold and six in polished steel, each handcrafted in the traditional way.

The XII Birthday Edition is embellished with large Roman numerals in the style of the historical pocket watches of the Carl Moritz Grossmann manufactory’s namesake. The numbers and logo have been engraved and finished with black lacquer. The delicate, handcrafted, poiré-shaped hands annealed to a blue hue harmonise perfectly.

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limited to 6 watches each worldwide

XII Birthday Edition

Dial crafted by a master – traditional 19th century silver-plating by friction brought into the modern age.
Grossmann Uhren celebrates its twelfth anniversary with the XII Birthday Edition watch on 11 November 2020.

Details

The dial

The winding crown and the pusher

The vintage look

The dial

Watchmakers in the 1860s and 70s used what was known as grain or silver plating by friction to refine the surface of high-quality dials. This process was widespread in the pre-industrial era and was often used in Glashütte and did not require electricity.

A whitish powder consisting of silver granules, salt and tartar is rubbed onto a brass sheet using a little water and a brush. It was, and still is, essential to clean and roughen the dial thoroughly beforehand. All the engravings on the dial are filled with lacquer before being silver-plated and then fired in a kiln to avoid excessive silver build-up.

The surface is sanded to roughen it, which also removes any excess lacquer so that only a deep black inlay remains in the engraved areas. As the silver powder does not stick to the lacquer, the engravings and numerals are completely left out of the silver plating process, which means they retain their rich black colour creating an optimum contrast to the bright silver.

The winding crown and the pusher

The gently curved form and the tapered chamfer of the strap lugs enhances the eloquent silhouette of the case.

Aesthetic and functional — the circumferential groove makes it easy to pull out the crown. The pusher for the  handsetting train is set directly below the winding crown.

This proprietary hand-setting mechanism eliminates two significant challenges: altering the hands unintentionally when pushing the crown back into place and avoiding the ingress of foreign particles like dust during the adjustment process.

The vintage look

The XII Birthday Edition is embellished with large Roman numerals in the style of the historical pocket watches of the Carl Moritz Grossmann manufactory’s namesake. The original Moritz Grossmann logo: ‘M. Grossmann’ from 1875 underlines the elegant vintage look. The numbers and logo have been engraved and finished with black lacquer. The delicate, handcrafted, poiré-shaped hands annealed to a blue hue harmonise perfectly.

The calibre 100.1

Discover everything about the heart of the XII Birthday Edition.

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Tech Specs

Movement

Manufacture calibre 100.1, manually wound, adjusted in five positions

Special features

Grossmann balance; lateral pusher for disabling the handsetting mode and starting the movement; 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 engraved by hand; 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 handsetting

Functions

Hours and minutes, subsidiary seconds with stop seconds, Grossmann winder with pusher

No. of parts

198

No. of jewels

20 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

Operating elements

Crown in 750/000 gold or steel to wind the watch and set the time, pusher in 750/000 gold or steel to start the movement

Case dimensions

Diameter: 41.0 mm, height: 11.35 mm

Movement dimensions

Diameter: 36.4 mm, height: 5.0 mm

Case

Three-part, precious metal/ steel

Dial

Silver-plated by friction, engraved numerals, with black finish

Hands

Hand-crafted, steel

Crystal / display back

Sapphire crystal, antireflection-coated on one side

Strap

Hand-stitched alligator leather with prong buckle in precious metal/ steel

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XII Birthday Edition

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