The name of the collection directly related to the first ship powered by energy derived from the reaction taking place in the nuclear reactor. Watches from the series commonly known as Nautilus are characterized by a massive case, the diameter of which is 46 mm, hardened mineral glass with the K1 designation and backlighting with special tritium tubes. The heart of the watch is the Japanese Seiko Epson movement with the designation NH35A in the automatic version and the VK61 in the quartz version.