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The Seiko Prospex Marinemaster SLA079 is a 2024 re-interpretation of Seiko's 1968 professional diver, built as a serious dive instrument rather than a desk diver. It pairs a 42.6mm stainless steel case and bracelet with a textured white dial, broad LumiBrite-coated hands and markers, a unidirectional elapsed-time bezel, a date window and dual-curved sapphire with inner anti-reflective coating. It sits at the top of the Prospex line, above the cheaper 6R-powered Prospex divers, in the same territory as other Marinemaster models with Seiko's higher-grade 8L automatic. It suits buyers who want a heritage-styled, high-spec Seiko diver and accept a heavy, thick case and a premium-tier mechanical movement that needs servicing.
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Owners of the SLA079 and the wider Marinemaster line praise the finishing, the dial texture and the high-beat movement, and treat it as a genuine tool watch. Common complaints are the case height and weight, the plain bracelet, and the cost of servicing the 8L movement.
The Seiko Prospex Marinemaster SLA079 is an automatic diver's watch inspired by Seiko's original 1968 professional diver's watch. It keeps the distinctive case shape of that model and uses modern manufacturing techniques. It was introduced in 2024 as part of the Marinemaster collection.
The 42.6mm stainless steel case has polished surfaces that reference the 1968 design. The bezel and crown are redesigned to improve grip and operation. The textured white dial has black accents, prominent hour markers and broad hands coated with LumiBrite for visibility in low light. A date display is included, and the unidirectional rotating bezel measures elapsed time.
Inside is Seiko's Caliber 8L35 automatic movement, which runs at 28,800 vibrations per hour and has about 50 hours of power reserve. It has 26 jewels, manual winding and a stop-seconds function for precise time setting. The watch is fitted to a stainless steel bracelet with a three-fold clasp and diver's extension.
