This is a unique model that uses a UTC dial hand that displays UTC time on an additional dial at the 6 o'clock position. By the number on the ring at the "6 o'clock" position, you can find out the approximate time in the cities of the Northern Hemisphere. The UTC dial arrow slowly makes one revolution during the day. Fonts, which are often seen on old maps and aviation diagrams, are used to mark each city and the numbers on the disk, giving it an intellectual touch of the 1600s, when the world was developing. By intentionally using a font different from the font of the aviation slide rule section, we also sought readability. The dial and bezel are enlarged to improve visibility, and the case is shaped like a mortar to reduce weight and emphasize subtlety. It has a matte surface that emphasizes the hairline, and the tilt of the front panel and the protection of the buttons are treated with mirror treatment, which gives the design a clear look. A map of the Northern Hemisphere is engraved on the back cover.