Seiko Luxe Watches Prospex U.S. Special Edition SPB421

Seiko Luxe Watches Prospex U.S. Special Edition SPB421

Some watches tell time. The Seiko Prospex SPB421 tells a story that began in 1965, the year Seiko built its first professional diver’s watch, the legendary 62MAS. Nearly six decades later, Seiko Luxe reinterprets that icon for American collectors in a U.S. Special Edition, available exclusively in the United States.

The SPB421 is one of a trio of special editions celebrating America’s most demanding dive destinations. This one belongs to Alaska. Its textured, gradient deep-blue dial evokes the glacial moulins, the vertical ice shafts carved through Alaska’s glaciers. As the light moves, the dial shifts from midnight blue to icy depth, framed by a dark blue unidirectional elapsed-time bezel.

Beneath the dial beats Seiko’s in-house Caliber 6R35, a 24-jewel automatic movement with an approximately 70-hour power reserve. You can take it off Friday evening and it will still be running Monday morning. It also offers hand-winding and hacking seconds.

This is a true ISO-standard diver’s watch, rated to 200 meters. It has a screw-down crown and caseback, LumiBrite on the hands, markers, and bezel pip, and a curved sapphire crystal with inner anti-reflective coating for clear legibility above or below the surface.

At 40.5mm across, 13.2mm thick, and 47.6mm lug-to-lug, the SPB421 wears with the balanced, vintage-correct proportions enthusiasts love about the 62MAS reissue family. The stainless steel case and three-link bracelet are protected by Seiko’s super-hard coating against everyday scratches. A tri-fold push-button clasp with a secure lock and diver’s extender lets it slip easily over a wetsuit or onto a relaxed Miami wrist.

For collectors, the SPB421 is a meaningful piece: a U.S.-only release, a direct link to Seiko’s dive watch heritage, and one of the most distinctive dials in the modern Prospex lineup.

Lexor Miami is an authorized Seiko dealer. Every SPB421 we sell is 100% authentic and backed by Seiko’s official 3-year manufacturer warranty. Shop online or see it in person at our Miami showroom.

Key Features

• U.S.-exclusive release. This Seiko Prospex Special Edition is sold only in the American market.
• 1965 heritage. It is a modern reinterpretation of Seiko’s first diver’s watch, the iconic 62MAS.
• Alaska moulin dial. The textured gradient deep-blue dial is inspired by Alaska’s glacial ice shafts.
• In-house automatic movement. The Caliber 6R35 has a ~70-hour power reserve, so it survives a full weekend off the wrist.
• True dive watch. It is rated to 200m (660 ft) to ISO diver standards, with a screw-down crown and caseback.
• Night-ready legibility. LumiBrite luminous material is applied to the hands, indices, and bezel.
• Sapphire crystal. The curved crystal has inner anti-reflective coating for a clear, glare-free read.
• Vintage-correct sizing. At 40.5mm, it wears comfortably on most wrists, with a 20mm lug width for easy strap changes.
• Built to last. The stainless steel case and bracelet carry Seiko’s super-hard scratch-resistant coating.
• Secure, adjustable clasp. The tri-fold push-button clasp has a safety lock and a diver’s extender.
• Collector appeal. It is part of the 2023 U.S. Special Edition trio, alongside the SPB419 and SPB423.
• Buy with confidence. Lexor Miami is an authorized Seiko dealer, and every watch comes with the official 3-year Seiko warranty.

Technical Specifications