**Omega Ref 311.30.42.30.01.005 (BP 21)** Case: 42mm stainless steel with polished and brushed finishing Dial: Black with applied hour markers and luminous hands Movement: Automatic caliber with date window Crystal: Scratch-resistant sapphire Water Resistance: Professional-grade protection Bracelet: Stainless steel with integrated links Bezel: Fixed stainless steel Clasp: Fold-over safety clasp Case Back: Transparent exhibition caseback Functions: Hours, minutes, seconds, date display This reference combines robust construction with refined aesthetics, delivering the precision and durability expected from Omega's professional collection.