Omega 231.50.39.21.08.001 Seamaster Aqua Terra Specifications: Case Shape Round Case Dimensions 38.5mm Case Material Yellow Gold Dial Color Champagne Crystal Anti-Reflective Scratch Resistant Sapphire Bezel Yellow Gold Water Resistance 150m Case Back Yellow Gold Band Material Yellow Gold Color/Finish Yellow Gold Buckle Pin buckle Movement Automatic – Chronometer Complications COSC Certified Yes