A very interesting watch. I had in mind trying to make a similar thing, but as a clock, inspired by my Meistersinger 12 hour single handed watch. It would be electronic. Easy enough to set up a commonly available movement as a single handed clock but I wanted to make it so that it looked like a tachometer with the quadrant 0 to 12 and the hand jumping from the 12 to the 0, say one quarter of the quadrant in the final second of the 12 hours.

I looked to see what was available in small stepping motors and programmable drivers but eventually decided that it was beyond my skills.

Peter

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