Ever since its first divers watch in 1965, Seiko has developed new technologies, features, and designs that have made the Seiko Prospex divers watch collection a favorite among professional and recreational divers the world over.Continuous innovation and enhancements over the decades in safety, reliability, legibility, and ease of use have made Seiko a leader in divers watches.The Marinemaster is Seikos flagship series for divers watches. Equipped with a robust and high-performance movement with stable accuracy designed exclusively for divers watches, it represents the top tier of Prospex watches in a diving category that is integral to the history and culture of Seiko.The edges of the case and bezel are mirror-finished to prevent snagging and damage to the equipment used by divers, creating a brilliant appearance while improving functionality.For the first time in a Seiko divers watch, the new Marinemaster creations feature an exhibition case back, allowing a view of the finely finished, high-performance mechanical movement. By reconsidering the case structure and using the slimline Caliber 6L37, Seiko created what is its thinnest mechanical divers watch currently (12.3mm) while adding a view of the movement.Wearability and comfort are paramount in the new Marinemaster. The entirely new bracelet features ellipse-shaped links with mirror-finished, dual-curved surfaces.