The birthplace of the Spring Drive watch is Nagano Prefecture, surrounded by 3000-meter mountains. Numerous rivers flow from these high mountains, forming a rich natural environment over the years. The "Aderi River," a first-class river in the Kisogawa River system, has created a gorge called the "Aderi Valley." The emerald green Aderi River is the theme of this watch, and its fresh color tones and exquisite dial pattern depict the clear and ever-changing natural scenery. The timepiece features the Spring Drive 5days 9RA2 movement, powered by a mainspring and capable of running for approximately 120 hours (5 days) when fully wound, with a high precision of average monthly rate of ±10 seconds.