Reliability and precision
The Oyster Perpetual’s case is guaranteed waterproof to a depth of 100 metres (330 feet). Its middle case is crafted from a solid block of Oystersteel. The case back, edged with fine fluting, is hermetically screwed down with a special tool that grants only certified Rolex watchmakers access to the movement. Another core component in the watertight structure is the Twinlock winding crown that is fitted with a double waterproofness system and screws down securely against the case.