A traditional wristwatch has a relatively straightforward role: to tell the time. All that is needed is a hand for the hours, another for the minutes and perhaps a power reserve indicator to keep track of running ti me. HM4 has a hand for the hours, another for the minutes and a power reserve indicator. HM4 tells the time.
The aviation inspired case and engine of the HM4 are one. Neither would, nor could, exist without the other, yet each is so transcendental as to be able to stand alone as a work of art in its own right. The HM4 engine is the culmination of three long years of development. Each of the 300 plus components including the regulator and even the screws was developed specifically for this anarchistic calibre. Horizontally configured dual mainspring barrels drive two vertical gear trains, transferring power to the twin pods indicating h ours/minutes and power reserve.