From MB&F comes an absolutely unconventional wristwatch. The case of the HM4 Thunderbolt is inspired by the world of aviation. Each of the 300 components of the calibre (the result of three long years of research and development) - including the regulating organ and screws - was developed specifically for this revolutionary movement. Two horizontal barrels connected in parallel via two trains of vertical wheels transfer energy to the escapement at the centre of the motor and move the twin hour and minute indicators and the power reserve. The numerous sections of the sapphire crystal case reveal the details and finishes of HM 4's complex micromechanics.
The shimmering aerodynamic shape of the Thunderbolt's titanium and sapphire 'reactors' stems from Max Busser's childhood passion for model aeroplanes, although none of them had anything like the futuristic look of HM 4. The incredible transparent sapphire glass section of the case takes more than 100 hours to transform a solid block of opaque crystal into a complex convex surface, which allows light to penetrate and illuminate the Thunderbolt's engine. Every component and every shape has a technical purpose: nothing is superfluous and every curve, every line is deliberately in harmony. The articulated lugs ensure absolute comfort.
Horological Machine No4 Thunderbolt - Technical Specifications
Motor:
Three-dimensional engine fully developed by MB&F
Manual winding; two barrels in parallel
Power reserve: 72 hours
Balance alternation: 21,600 bph/3Hz
Number of components: 311
Number of rubies: 50
Functions:
Hours and minutes on the right-hand dial
Power reserve display on the left-hand dial
Separate crowns for setting the time and for manual winding
Case:
Grade 5 titanium and sapphire crystal
Dimensions: 54 mm width x 52 mm length x 24 mm height
Number of case components: 65
Loop articulation: 3°
Sapphire glass:
Five sapphire crystals: 2 for the dials, 1 for the central section of the case, 2 x the upper and lower displays
Strap and buckle:
Hand-sewn black alligator strap with custom-designed titanium and white gold folding clasp attached to articulated lugs.
The HM4 Thunderbolt model will be available in Italy in GMT boutiques in Milan and Porto Cervo from October 2010.
