This watch is based on a German Military Diver watch. It's big! And, you should have no trouble reading the time with the large numbers and markers. When charged with light, they glow bright in the dark too. The smaller red hand is a 24 hour GMT indicator which can be set to a second time if you wish. An inner scale shows the time in 24 hours. The movement is a Swiss-Ronda Cal.515.24H quartz type. There is a special screwed crown protecting system (with a screwed cover) at the 10:00 position. With a domed hardened mineral crystal.