Hamilton Khaki Aviation Converter Auto Black DialAdvanced technology for the sophisticated aviator. Calculate critical conversions and metrics at a glance with the Khaki Pilot Converter Auto Chronos bi directional, rotating slide rule bezel. This high performance tool converts units, such as feet to meters or miles to kilometers, and currency. Add in the H 21 Si automatic chronograph movement with its superior anti magnetic silicon hairspring and this stylish 44mm pilots watch has everything you