The Montbrillant Datora is a fabulous watch full of complications. "Havana" colored dial, Silver Toned/Luminous Index (stick) hour markers & Hands. This watch Features: 1) 1/5th second Chronograph. 2) is fitted with the "Slide Rule" aka "Navigation Computer" which allows to compute different airborne calculations such as fuel consumption, climbing times & converting miles into nautical miles or kilomters. 3) Has a Day & Month Window displayed below the 12 o'clock position. 4) Date indicated by hand with half-moon around the dial. 5) GMT/2nd Time Zone indicated in the sub-dial at the 9 o'clock position - The timezones of the worlds' major cities are engraved on the case back for quick reference. Aprox. Power Reserve 42 Hours.