Designed for connoisseurs of classic and complex mechanical watches, the Grand Opéra collection features modern masterpieces encased with sapphire crystal glass, and Swiss titanium case back allowing you to admire the beauty of this collection.Designed for connoisseurs of classic and complex mechanical watches, the Grand Opéra collection features modern masterpieces encased with sapphire crystal glass, and Swiss titanium case back allowing you to admire the beauty of this collection.