Eterna watch royal kontiki gmt the royal kontiki gmt model has a fantastic design element desirable most to those who enjoy the technical side to eterna watches the eta 3945 a built with a height of 59mm and case fitting diameter of 30mm the movement can bear a total of 30 jewels and creates 28 800 vibrations per hour the movement offers an incredible level of reliability because it can deliver 65 hours of power reserve to the watch making it a must have during long haul flights for the