The Instrument DBG Equation GMT features two separate time displays, each driven by its own barrel and gear train with its own escapement and balance which is really unusual and I have never seen something like this anywhere else. The two displays can be set independently of eachother. The setting is done by the two crowns to the left and right.
The fact that there are two independent displays offers the possibility to set two timezones differing from Greenwich Mean Time even by minutes while most GMT watches allow the difference only by hours.
While the two timezones share a central seconds hand on the dial, the subdial at 12 o'clock is showing the equation of the two time zones on a 24-hour basis thus enabling the wearer to see the time difference between the two timezones and ascertaining whether it is day or night in the second timezone.
This watch is a feat, not only from a techological standpoint, but also from the dial layout and the beautiful dial appearance. I liked the rose gold version more than the steel version, but both are truly stunning timepieces proving once more the extraordinary competence at Arnold & Son.
Enjoy the pictures which I took at the Baselworld show.