Greubel Forsey’s GMT Earth timepiece provides a comprehensive three-dimensional view of the Earth from north to south pole. They explored the architecture of this timepiece from different angles, giving the movement and case a more prominent role.

With this new work, Robert Greubel and Stephen Forsey are once again pushing the envelope and venturing into uncharted territory. GMT Earth offers a stunning 360° panorama of the Earth from the North Pole to the South Pole. This technical feat is achieved through an original movement architecture related to the shape and size of the case. Revealing the entire Earth requires complex sapphire crystal applications, a skill that Greubel Forsey has researched and exploited over the years.

The Earth isn’t the only 3D element in this watch – it’s a feature of every level. The three-dimensional effect first appears at the highest point of the dial, with hours, minutes and small seconds. Then, the eyes lightly pass the GMT indicator with the red triangular hand, followed by the power reserve indicator displayed by the slender hand. Finally, our eyes fall to the very bottom of the dial, which shows the earth together with the third key invention of Greubel Forsey, the Tourbillon 24 Stopwatch.

GMT Earth can clearly see three time zones simultaneously within a quarter of an hour. In addition, on the movement side of the watch, 24 time zones display summer and winter time, complementing the world time indicated by the globe.

The proportions of the case have been carefully designed to accommodate the special art on the high-dome sapphire crystal bezel and strap. The iconic side panels with inscriptions embodying the key values ​​of Robert Gaupper and Stephen Fauci adorn the case. This platinum edition is limited to 33 pieces.

technical details
Model: GMT Earth
Platinum Limited Edition
move
Manual winding movement with 3 patents
GMT • Second Time Zone • Rotating Earth with Universal Time and Day and Night • Full and Global View from Northern Hemisphere to Southern Hemisphere • World Time in 24 Time Zones • Summer and Winter Time • City View Summer Time • Horizontal Window Displaying Equator • GMT Buttons • 24 Second Tourbillon • Hours and Minutes • Small Seconds • Power Reserve

Movement size
• Diameter: 36.40 mm
• Thickness: 11.55mm

number of parts
• Movement: 453 parts
• Tourbillon cage: 86 parts
• Frame weight: 0.39 grams

number of jewels
• 60
• Olive Dome Jewelry in a Gold Sink

Chrono Power Reserve
• 72 hours

barrel
• Two coaxial tandem fast-turning barrels (one revolution in 3.2 hours), one of which is fitted with a sliding spring to avoid excessive tension

balance wheel
• Variable inertia with gold averaging time screw (10mm diameter)

frequency
• 21,600 vibrations/hour

gossamer
• Phillips end curve
• Geneva Studs

motherboard
• Nickel silver, matte and speckled, polished bevel and countersunk, ruled sides, nickel palladium finish

bridge
• Nickel silver, matte polished bevel and counterbore, ruled sides, nickel palladium finish
• Black polished stainless steel tourbillon bridges, hand-polished bevels and countersunk
• Black polished steel screws, blued by heat treatment

Tourbillon
• 25° tilt, 24 seconds rotation
• Light alloy cage struts
• Titanium cage bridge
• Gold counterweights

transmission
• Involute profile
• Tangential helical gear on the fixed wheel and profiled teeth on the escape wheel pinion

show
• Hours and minutes
• Small seconds
• 72 hour power reserve sector
• Second time zone GMT
• 24 time zone Universal Time
• Rotating Titanium Sphere with Universal Time
• Complete view from North Pole to South Pole
• summer time
• daytime nighttime

External
case
White Gold with 18k Gold Nameplate, Engraved Text, Hand Finished Text, Screwed-In Strap
Diameter: 45.50mm
Height: Case 16.18mm (synthetic sapphire dome height 18.00mm)
Side window, synthetic sapphire crystal
glass three-dimensional, variable geometry lugs
Three-dimensional synthetic sapphire crystal case back with integrated dome
Three-dimensional asymmetric synthetic sapphire crystal bezel
Raised polished engravings “GMT Earth” and “Greubel Forsey” on hand punched background
golden security screw
White gold GMT button with raised engraving on hand-punched background
Hand engraved personal number
Case Water Resistance: 3 atm – 30 m – 100 ft (Standard NIHS 92-20/SN ISO 22810:2010) Table
Crown: White gold, synthetic sapphire insert, with GF logo

dial side
Synthetic sapphire multistage indexes, electro-grown indexes, engraved lacquered minutes and small seconds
Gold power reserve and GMT hands, engraved and lacquered, hand-finished
Rotating Globe Synthetic Sapphire with Day and Night UTC Hands, Engraved and Lacquered

Movement side
Synthetic sapphire disc showing city name surrounded by 2 gold rings (UTC and daylight saving time) Engraved and lacquered
Gold “Daylight Saving Time” plate with individual numbers, embossed
Earth South Pole with UTC Indicator, Engraved and Lacquered, Hand Matte Ground

pointer
Hours, minutes, small seconds and power reserve in polished stainless steel, black finish, hand-polished countersinks
Second time zone GMT indicator, red triangle

Strap and Buckle
Black rubber or hand-stitched alligator leather
White gold folding clasp, hand-engraved GF logo