Automatic El Primero Zenith 4021 Movement - Power Reserve Indicator above 6 O'Clock. Solid 18K Yellow Gold Case 36mm, brand new custom made croco leather strap fitted with original 18K yellow gold deployant buckle. Exhibition Sapphire Crystal Caseback. Scratch Resistant Sapphire Crystal, 30 Meters / 100 Feet Water Resistant. Box & Cert Dated MARCH 2011.