i'm oversimplifying it because i haven't done extensive research on HOW it works, but from what i understand, the clock portion of the watch runs on a quartz (so the seconds sub-dial ticks), but the chronograph runs on a main spring so you get that smooth sweeping motion when you start it.
i'm not sure if the quartz provides power to the main spring or vice versa, but i think some high-end manufacturers have dabbled in them so it's probably not BAD. IMO it seems pretty cool.
If I'm not mistaken it's the movement introduced in this post:
so is it like some of the ISA movements where the chronograph seconds hand sweep?
or like the seiko movement in the issey miyake quartz chronograph series where the seconds hand tick but the stopwatch seconds hand sweep?
Not a fan because it requires a battery :(
Climbing and falling, with tip of tongue
running laps around the hollow drain,
three men remembers their bitter ex-dates
passing by, their names flipped into a bottom
Grand Seiko SBGE033, Jaquest Droz Grande Seconde, Breitling Navitimer Cosmonaute, Prometheus Piranha, Orient Wingman, Zeppelin Flatline 7366-3, Glashutte Original PanoMaticLunar, Epos Emotion 3390, Steinhart Ocean 2 Premium, Hamilton Khaki Field, Omega 1965 Vintage, Seiko 5 SNKK27, Seiko 1977 Vintage, Nomos Orion 38, Wittnauer 1960's Vintage, Movado SL1 Chrono, Seiko SBQK085, Cyma Le Locle, Casio Oceanus OCW-S100-1AJF
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