This model from the Prospex collection, an emblematic line of Seiko, is a watch with an automatic mechanical movement, manual winding, and 24 rubies. The bracelet is made of stainless steel, just like the 43mm case, which also has a hard coating. It has a power reserve of approximately 70 hours and a stop-seconds function. The black dial includes a window at 3 o'clock that indicates the date. It is covered by a curved sapphire crystal with anti-reflective coating on the inner surface. The hands, numbers, and bezel feature LumiBrite to enhance readability. This design is particularly intended for compressed air diving, as it is water-resistant up to 200 meters.