page_title: MB&F
section_title: Horological Machine No.4 (HM4)
hierarchical_section_title: MB&F / Machine Collections / Horological Machines / Horological Machine No.4 (HM4)
caption_attribution_description: English: Horological Machine No.4 Thunderbird
context_page_description: Maximilian Busser and Friends, normally shortened down to MB&F, is a Swiss watch brand founded by Maximilian Busser in July 2005 and based in Geneva, Switzerland.
context_section_description: HM4 features two perpendicular dials respectively indicating hours/minutes and power reserve set in a futuristic case resembling two jet turbine pods.
  HM4 Thunderbolt was awarded the prize for best Concept and Design Watch Concept at the 2010 Grand Prix d'Horlogerie de Genève.
  Functions: 
  Hours, minutes and power reserve indicator. Hours and minutes on right dial, power reserve indicator on the left dial. Separate crowns for time setting and winding
  Movement:
  HM4's movement was designed and developed by MB&F with Laurent Besse and Beranger Reynard of Les Artisans Horlogers. The 311 components were developed specifically for the Thunderbolt due to the extreme nature of its architecture.
caption: HM4 Thunderbolt
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