Prospex Black Series Limited Edition. Designed for those who treat life as the ultimate adventure, Seiko Prospex keeps moving forward, meeting every challenge with technological excellence and winning design. Joining the popular Black Series, this rugged Limited Edition features a 23-jewel automatic movement which beats at a frequency of 21,600 vibrations per hour, with a power reserve of approximately 41 hours, and offers manual winding capability. Following ISO standards for scuba diving at depths of up to 200 meters, this dramatic watch includes a uni-directional rotating elapsed timing bezel and secure screwdown crown and caseback. The highly legible dial, in black with orange and beige accents suggesting rays of light penetrating through the dark ocean at night, includes a date calendar and LumiBrite hands and markers. Crafted of stainless steel with black hard coating and black silicone strap. 200m Water Resistant