Limited to 1, 990 pieces, the Engineer Hydrocarbon Aero GMT Sled Driver has been designed to honor legendary US Air Force Pilot Major Brian Shul, one of only 92 pilots to fly the SR-71 Blackbird. CalledThe Sledby some pilots who flew it, the Blackbird was a long-range, high-altitude, Mach 3+ strategic reconnaissance aircraft. The dial has been emblazoned with the SR-71 planform at 6 oclock, the legendSLED DRIVERabove the planform and Major Brian Shuls signature just below center dial. Moreover, the case back is engraved with the Mach 3+ insignia emblem, worn by all qualified SR-71 Blackbird crewmembers. The Engineer Hydrocarbon Aero GMT Sled Driver is the ultimate GMT aviation watch with the worlds brightest bezel. BALL brings instant low-light visibility to a new level thanks to a ground-breaking micro gas light rotating bezel. The watch is equipped with a bi-color top sapphire bidirectional rotating bezel which carries a 24-hour graduation, and marks out a third time-zone