The Oyster Perpetual Cosmograph Daytona in 18K yellow gold, with a gold and gloss black dial and an Oysterflex strap, with a black Cerachrom bezel engraved with a tachymeter. Cosmograph Daytona 18K gold models with Cerachrom bezel, all with Oysterflex straps. Developed and patented by Rolex, this innovative strap combines the robustness and reliability of a metal strap with the comfort of a rubber strap. The inside of the strap is composed of two curved elastic metal sheets, one on each side of the strap, and the outer layer is covered with high-performance black rubber injection molding. In order to ensure a more comfortable wearing, the inside of the Oysterflex strap is equipped with a cushion, and the Oyster safety buckle prevents the strap from being accidentally opened. The strap length can be adjusted through the Rolex Glidelock extension system.
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