The MB&F HM4 Thunderbolt Watch is Busser’s latest since the HM3 Frog watch, and a return to a more serious approach to timekeeping design. The group first revealed the engine of the HM4 at Basel World 2010 in March, suggesting a few hints about the final design that has been unveiled today. The watch features two bullet-like chambers encasing the time display and power reserve, harnessed around the HM4 engine. That engine is hand-constructed from 311 parts, providing an accurate measure of time down to the nanosecond. The engine and display are enclosed in a titanium caseback and sapphire case, both of which combine for 210 hours of machining for the exterior itself.
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