This appears to be a Rolex Oyster Perpetual, which is known for its classic and understated aesthetic, focusing on essential timekeeping. Rolex Oyster Perpetual watches are typically made of Oystersteel, a highly corrosion-resistant steel alloy developed by Rolex. The Oyster Perpetual is a self-winding, waterproof chronometer wristwatch. The "Perpetual" part of the name refers to its self-winding movement