Grande Sonnerie

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  • Petite and Grande Sonnerie timepiece
  • Minute repeater on demand by crown mounted pusher
  • Striking modes selection by pusher
  • Grande and petite sonnerie, silence
  • Striking power reserve
  • Tourbillon 24 Secondes
  • Hours and minutes
  • Small seconds
  • Movement power reserve

Diameter

43.50 mm

Height

16.13 mm

Back Case

Transparent back with asymmetrical convex synthetic sapphire crystal, Three-dimensional, variable geometry-shaped lugs, Raised polished engraving “Grande Sonnerie” and “Greubel Forsey” on a hand-punched background, Gold security screws

Crown

In white gold with engraved GF logo

Water Resistance

3 atm – 30 m – 100 ft

Movement Type

Hours and minutes, Small seconds on a sector, 72-hours power reserve on a sector

Power Reserve

72 hours

Frequency

21’600 alternations/hour

Jewels

85, Olived-domed jewels in gold chatons