The “Equation Espace” for men and for women by Girard-Perregaux combines the finest in horological micromechanies and microelectronics. On the dial, a small gold “Earth” sphere shows months, seasons, solstices and equinoxes. Apertures in the dial show the date and lunar months. Water-resistant cases in 18K yellow gold with transparent sapphire back revealing the handsomely decorated and polished movement. 5-year battery life. (GIRARD-PERREGAUX)