C-6600 This is highly collectible watch Valued 600 to 1000
Sold As is, watch is running but will most likely need servicing 

Dial: Bold 24-hour G.C.T. (Greenwich Civil Time / Greenwich Mean Time) dial marked from 1 to 24, designed to match celestial navigation tables
Hacking Feature: Pulling the crown stops the second hand, allowing navigators to sync time down to the exact second
Movement: 22-jewel manual-wind, adjusted to temperature and 6 positions. It shares roots with the famous Hamilton 992B railroad movement, though it is pendant-set rather than lever-set