Moritz Grossmann GMT

With the GMT, the independent Glashütte manufactory Moritz Grossmann presents its first watch model with two time zones.

Thanks to the classic, functional design of the watch, the two time zones stand out clearly from each other. The 12 hour scale in the middle of the dial shows the first time. It is framed by the outer 24-hour scale for the second time. This allows you to see at a glance whether it is day or night in the country in the other time zone.

The second time zone with 24 Arabic numerals is designed as an outer circumferential scale. A separate hand element in compact arrow form shows the respective hour. A separate setting crown at 10 o’clock allows the arrow indicator to be quickly adjusted in hourly increments both forwards and backwards. The 12- hour display in the centre of the dial remains unaffected by this. The 24-hour display is transmitted to the time zone ring via a complex system of gear wheels and always runs in accordance with the centre time. The 24-hour display also follows the 12-hour hand when the centre time is set using the crown.

The GMT is equipped with the calibre 100.8 in a high-artistic finish and the sapphire crystal back reveals the elaborate mechanics of the calibre. It features the characteristic components of the Moritz Grossmann movements, such as the 2/3 plate with the raised gold chatons, the Grossmann ratchet, the separately removable winding unit with pusher mechanism and the cantilevered balance cock with micrometer screw, as well as the mass-optimised balance.

On the GMT, the mechanism for the second time is integrated into the movement on the dial side. The 24-hour display is transmitted via the hour wheel of the centre time to another hour wheel and an intermediate wheel to the ring of the second time zone. The second time zone display can be adjusted via the second crown at 10 o’clock. A ratchet wheel with ratchet spring is used to adjust the time in the pre-defined hourly gearshifts.

The case is available in either rose or white gold. A dial in brilliant argenté emphasises the clarity of the design in the rose and white gold version. The white gold model features a dial in champagne tone for a warm colour accent. The 24-hour scale with blue Arabic numerals and matching arrow indicator harmoniously stands out from the 12-hour scale in the centre of the dial. Here, the unique lance-shaped hands provide the characteristic accent. They are handcrafted in the manufactory, finished and annealed in dark brown. For the white gold model with argenté opaline dial, the entire set of hands is polished stainless steel.

With the GMT, the independent Glashütte manufactory is enriching its collection with a long-awaited time zone watch that beautifully reflects the very essence of the much-travelled cosmopolitan, polyglot writer and aesthete Moritz Grossmann. The clear design, the advanced mechanics and the perfection of the craftsmanship represent Schönstes deutsches Handwerk in a unique way and bear witness to the highest level of skill inherent in Grossmann’s timepieces.

The GMT is available in three versions:-
GMT rose gold, reference MG-002154, argenté dial
GMT white gold, reference MG-002225, argenté dial
GMT white gold, reference MG-002155, champagne dial

Technical details

Movement
Manufactory calibre 100.8, manual winding, regulated in five positions
No. of parts: 253
Jewels: 26 jewels, of which 3 in screwed gold chatons
Movement dimensions: Diameter: 36.4 mm, height: 5.55 mm
Escapement: Lever escapement
Oscillator: Shock-resistant Grossmann balance with 4 inertia screws 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

Special features
Grossmann balance; hand setting override and start of movement with lateral pusher; second time zone (24-hour display) by means of exterior revolving hand, time zone display that can be corrected backwards and forwards at any time using the 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

Functions
Hours and minutes, subsidiary seconds with stop seconds, second time zone (24-hour display) by means of revolving hand, Grossmann manual winder with pusher

Case
Three-part, precious metal
Case dimensions: Diameter: 41.0 mm, height: 11.85 mm
Operating elements: Two crowns in 750/000 gold to wind the watch and set the time and the date, pusher in 750/000 gold to start the watch
Crystal/display back: Sapphire crystal, antireflective coating on one side

Dial
Solid silver, hour markers in gold
Hands: Manually crafted, in steel, for two variants annealed in brown

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

Versions

Reference MG-002154
Case: 750/000 rose gold
Dial: argenté
Hands: Manually crafted, steel, annealed to a brown hue

Reference MG-000857
Case: 750/000 white gold
Dial: argenté
Hands: Manually crafted, polished stainless steel

Reference MG-002155
Case: 750/000 white gold
Dial: champagne
Hands: Manually crafted, steel, annealed to a brown hue

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