Manufacture Royale 1770 Haute Voltige Black Technical Specifications Model: 1770 Haute Voltige Movement: Mechanical hand-wound Calibre: MR07 Self-winding mechanical movement Diameter: 36mm / thickness 9.45mm Power reserve: 40 hours Frequency: 3Hz, 21,600 vibrations per hour Plate and bridges: Entirely hand-decorated; Plate with Côtes de Gen?ve finishing, 5N engraving Balance spring: Flat Balance wheel diameter: 14mm Functions: Double time zone: Hours, Minutes Case: Material: Black PVD micro-blasted steel Diameter: 45 mm Thickness: 13.8 mm Caseback: Transparent Crystal: Double-sided anti-reflective sapphire Crown: MR logo, sanded caseback, hand-polished surface Flange: With hand-polished gold hour markers Water-resistance: 3 ATM Dials: Black côtes de Gen?ve 1st time zone: Black or blue sunray 2nd time zone: Raised, satin-finished circular counter with polished edge Strap: Material: Alligator, alligator lining, hand-rolled edges Buckle: Pin, hand-polished black PVD steel Folding clasp available upon request zdroj - http://watchesseven.blogspot.cz/2016/05/manufacture-royale-1770-haute-voltige.html