Developed to unique specifications, the Pelagos FXD models are designed and optimized for real-world conditions. FXD refers to the extra robust fixed strap bars of the case. Ref. No m25807kn-0001 Description Tudor Pelagos FXD Chrono Manufacture Calibre MT5813 (COSC) 43mm black carbon composite case Blue fabric strap Case 43mm black carbon composite case with matt finish Lugs: 22mm lug width Case thickness: 13.6mm Winding Crown Titanium screw-down crown with the TUDOR shield in relief Movement: Manufacture Calibre MT5813 with chronograph function Self-winding mechanical chronograph movement with bidirectional rotor system Bezel: 60-minute bidirectional bezel in titanium with matte black carbon composite insert, 120-click Crystal: Sapphire crystal Waterproofness: Waterproof to 200m (660 ft) Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks required Bracelet Blue fabric strap with self-gripping fastening system Size Guide