The ultimate in versatility, Riva portrays the simple beauty of a mother-of-pearl dial set in a stainless steel two-tone case and bracelet with the practicality of a date indicator, luminous hour and minute hands, a second hand, and 100M WR. Citizen Eco-Drive Riva has 26mm case and fold over clasp with push button. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E011.