ArmourLite Officer Field Series Chronograph - Black Dial - SS Case and BraceletWhen you are working in the field, you want a dependable and durable timepiece that can withstand whatever challenges you might face. The ArmourLite Officer Field Series Chronograph features a classic design, but is constructed to last with its ultra tough Armourglass and tritium illumination. Movement: Swiss Ronda chronograph 5040D Features: Date Crystal: Armourglass Case Material: Stainless Steel Case Color: Stainless Steel Case Diameter: 45mm