Hamilton Watch Khaki Aviation Converter Auto Chrono H76736730. Advanced technology for the sophisticated aviator. Calculate critical conversions and metrics at a glance with the Khaki Pilot Converter Auto Chronos bidirectional, 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 need for your next adventure in the sky.