Micro-technology engineer Maximillian Busser's No. 3 Frog watch—sorry, "horological device"—was certainly unconventional-looking. His latest, the No. 4 Thunderbolt, definitely keeps pace.

Released under Busser's MB&F brand, the aircraft-inspired Thunderbolt features a regular face and a "power reserve indicator," both oriented 90 degrees away from the way a conventional watch face is. In the recent Frank Stephenson video, that designer talks about the importance, in supercar design, of displaying a portion of the engine; Busser clearly has the same philosophy, and has spared no manufacturing difficulty to achieve it.

The striking transparent sapphire section of the case requires over 185 hours of machining and polishing to transform an opaque solid block of crystal into a complex, exquisitely curved panel allowing the light to come in and the beauty of Thunderbolt's engine to stand out.

Every component and form has a technical purpose; nothing is superfluous and every line and curve is in poetic harmony. Articulated lugs ensure supreme comfort. Highly legible time is a fringe benefit.