This SEIKO automatic watch houses the caliber 4R36, a high-precision movement that operates at 21,600 vibrations per hour. The 42.5 mm stainless steel case features a green dial with LumiBrite-treated indexes and hands, ensuring exceptional legibility in any environment, even in the dark. In addition, the green unidirectional rotating bezel adds an extra dimension of style and utility. This sports watch also features a calendar with the day of the week located at 3 o'clock, making it a practical tool for everyday use. The transparent screw-down case back, finally, allows a fascinating view of the internal machinery, revealing the craftsmanship behind the sleek appearance of this 5 Sports watch.