Patented in 2012, the nO-Ring® waterproofing system developed by Mauron Musy is an authentic innovation in the watch industry. The brand drew inspiration from the sealing systems used in the field of precision mechanical engineering and applied to watchmaking. The various elements – watch glass and caseback – are clamped down by satellite springs, while the bezel and case middle act as a brace. The world-first result is devoid of any screws, glue or joints that require replacement during maintenance services. This device also makes it possible to operate the crown under water. The latest model to emerge from the Mauron Musy workshops, this Classic Steel Armure is therefore perfectly water-resistant to 100 metres. The distinctive construction of the imposing and sophisticated case means that watch maintenance involves just one movement service every seven years.

Movement Mechanical automatic Eterna 3909A calibre, 30 jewels, 28,800 vib, rhodiumed with Côtes de Genève pattern, engraved oscillating weight, 65-hour power reserve. Functions Hours, minutes, seconds, date. Case 316L stainless steel, 44 mm. Anti-reflective sapphire crystal, front and back. Serial number engraved on the back. Water-resistant to 100 m (10 bar / 330 ft) with patented nO-Ring® system. Dial Black with Côtes de Genève pattern, date at 3 o’clock. Bracelet/strap HNBR rubber or black leather, folding clasp in 316L stainless steel. Other versions Dial in sunburst black gold, rhodiumed with Côtes de Genève pattern or sunburst blue.