Brand: Greubel Forsey
Model: Quadruple Tourbillon GMT
Diameter: 46.50mm
Thickness: 17.45mm
Case Material: White gold; sapphire crystals front and back with lateral sapphire window
Dial: Multi-level in gold, anthracite color
Indexes: Applied gold
The Movement
Functions: Local and home time; universal time indication
Diameter: 39.50mm
Thickness: 13mm
Power Reserve: 72 hours
Winding: Hand-wound
Frequency: 3 Hz (21,600 vph)
Jewels: 84 (train jewels olive shape in gold chatons)
Additional Details: Two double tourbillons; outer cage rotates once per four minutes; inner cage inclined 30º rotating once per minute. Two 10.70mm free sprung adjustable mass balances with Phillips overcoil balance springs. Mainplate and bridges nickel silver.