The two subdials on this instrument piece show mean solar time and sidereal time using two barrels and gear trains, as well as two balances and escapements (visible through an elegant opening in the lower half of the dial) running at different speeds to account for the four-minute difference between the two different measurements of a day. This fine 44mm timepiece in 18-carat rose gold is powered by the exclusive A&S1311 calibre, which operates at 21,600 vibrations per hour, offers a 40-hour power reserve and has a high-grade finish.