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BK7 Crystal Bezel Insert The BK7 Crystal has exceptional physical properties, is lead-free, lighter and of higher quality than other glass crystals. Its properties are: low dispersion, a low refractive index and high clarity. Deep satin finish This careful stylistic choice provides a more modern look to a design that aims to convey tradition and innovation at the same time. The deep satin finish is obtained through the use of special brushes by skilled craftsmen who finish each individual surface through a completely manual process. Several handmade steps are required to achieve a homogeneous result that passes the internal quality control process. BGW9 Super-LumiNova Swiss Super-LumiNova BGW9 is a phosphorescent pigment, otherwise known as Lume, emits a Blue-Green glow when properly charged by sunlight or artificial light. In a daylight condition, BGW9 is white in colour. Compared to the much more widespread C1 pigment, the BGW9 has a triple the brightness, making it the most widespread solution in the haute horology. A case-back engraved with a story of heroes Nereide’s hull, like that of her sister ship Nautilus, was shaped similar to a torpedo boat, designed by the well-known Curio Bernardis. Nereide was a Nautilus-class submarine in the Italian Royal Navy (Italian: Règia Marina) during World War I. Built circa 1912 at the navy yard in Venice and was sunk in 1915 by the Austro-Hungarian submarine U-5 under the command of Georg Ritter von Trapp.