Prospex Automatic Diver's Watch Re-Interpretation. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and style. Part of a rich legacy of innovation in high-intensity timekeeping, Prospex continues to celebrate a long history of sports watch excellence with recreations and reinterpretations of landmark achievements. Based on an iconic Seiko design, with upgraded materials, this automatic diver's watch is crafted of stainless steel with durable super-hard coating, and offers a black uni-directional rotating elapsed timing bezel in scratch-resistant ceramic, a sapphire crystal with anti-reflective coating on the inner surface, a screwdown crown and caseback, and a tri-fold clasp with push-button release, secure lock and extender.