Marathon 41mm Black Pilot's Navigator Nylon DEFSTAN Watch The Navigator Class of Wristwatches, developed in collaboration with Kelly Air Force Base in 1986, is a significant milestone in timekeeping technology. More than just an accessory, this high-impact composite fiber shell case watch is a vital tool for adventurers and professionals alike, reflecting the pursuit of progress and excellence. Movement: ETA High-Torque FØ6 No of Jewels: 3 Scale Quantity: 2 Scale Range: 1-12 (13-24) Calendar Type: N/A Luminous Features: Tritium Gas Tubes Crystal Material: Sapphire Crown Type: Pressure Case Material: High-Impact Composite Fibreshell Bezel Type: Bi-Directional Bezel Scale: 12 Hour Submersibility: 6 ATM Case Diameter: 41mm Case Thickness: 13mm Lug Width: 20mm