The modern-day, Swiss incarnation of Breguet takes up the ?equation of time? torch from its eponymous French forebear with this easy-to-read and ingeniously designed representation of the fluctuating relationship between ?real? solar and ?mean? civil time. What?s more, this halo masterpiece is allegedly heralding an all-new, sleeker look to the brand?s bestselling Marine line?
By Alex Doak

1. As ?marchante? suggests, this is a ?running? equation of time. This hand, with the sun on top, provides an at-a-glance indication of what the solar time reading is in relation to civil time. It runs behind or ahead of the civil time indications by ?16 to +14 minutes per year, matching each other 4 times annually. The anchor-tipped hand is the date indicator, which is represented by the retrograde scale just below the hour markers on the top half of the dial. 2. The dial features two types of engine turning, including a ?wave? pattern specifically developed for this watch. The movement used here is built on the automatic tourbillon from 2012?s Classique Chronometrie 7227 but slowed down from 10Hz to 4Hz.

3. This peanut-shaped ?equation of time? cam controls the solar-tipped hand?s variation in passage around the dial. Breguet kept the width of the watch down by growing the nickel-phosphorous cam on the underside of a sapphire crystal disc (which also indicates the months) using LIGA electroplating processes. This method delivers a high-level of accuracy that allows such detail as...