The Greubel Forsey Grande Sonnerie took 11 years of development and research, with no less than 935 parts and the perfecting an acoustic resonance cage. This timepiece has three modes to choose from: Grande Sonnerie (which strikes the hours and the quarters in passing), Petite Sonnerie (which strikes the full hours in passing) and Silence (which does not strike in passing). The pure, crystalline chime of the Grande Sonnerie is enhanced by an acoustic resonance cage made from titanium. Brand: Greubel Forsey Model: Grande Sonnerie Reference Number: Grande Sonnerie Movement: Manual Winding Case Material: Titanium Case Size: 43.5mm Dial: Black Gold Bracelet/Strap: Leather Gender: Men's Watch/Unisex Warranty: Manufacturer's Warranty Features: Minute Repeater Power Reserve Tourbillon Small Seconds Grande Sonnerie Petite Sonnerie Silence Sonnerie Shop other beautiful pieces in our Greubel Forsey collection For inquiries on the piece please contact: boutique@shsilver.com