Arvo Awristacrat gold watches for men and women are a statement in style and class for those who aren't afraid to step up their game. The upgraded stainless steel casing and backplate offer durability while maintaining a slim profile. There is also sophisticated date and weekday windows in a way that is unique to Arvo. Note for travelers and night owls - The mechanism that controls the switching of the "Day" window happens over a 3 hour period beginning at midnight and completing the transition at 3:00am. If your watch is not doing so set the time ahead 12 hours and your watch will be correct again. Strap/Band Width: 20mm for 40mm Case. Case Size: 40mm 7mm Thin. Water Resistance: 3 ATM. Battery: SR621SW. Interchangeable Genuine Leather band: the quick release function of Arvo Watch Bands makes them easy to switch out in a minute or two without tools.