Seiko Prospex Diver SLA065 "Save the Oceans"

The Seiko Prospex SLA065 “Save the Ocean” is a high-end interpretation of Seiko’s legendary 1965 diver, the 62MAS—the watch that established Seiko’s professional dive-watch lineage. Released in 2023 as a limited edition of just 1,300 pieces worldwide, the SLA065 was created as part of Seiko’s Save the Ocean initiative and specifically supports underwater archaeological conservation. Its standout blue dial features an intricate pattern inspired by the marine astrolabe, an ancient navigational instrument frequently recovered from historic shipwreck sites. The stainless steel case measures 41.3mm in diameter, 47.6mm lug-to-lug, and 13.1mm thick, with a combination of brushed surfaces and distortion-free Zaratsu-polished accents. A dual-curved sapphire crystal, unidirectional dive bezel, screw-down crown, generous LumiBrite application, blue silicone strap, and 200 meters of water resistance complete the professional dive-watch package.

Inside is Seiko’s premium Calibre 8L35, an automatic movement developed specifically for the brand’s higher-end mechanical dive watches. The 26-jewel movement operates at 28,800 vibrations per hour and provides approximately 50 hours of power reserve, along with manual winding, hacking seconds, and a date display.
The SLA065 sits well above Seiko’s mainstream Prospex offerings, combining the historically important 1965 diver architecture with elevated case finishing and one of Seiko’s highest-grade dive-watch movements. Its individually numbered caseback, production of only 1,300 pieces, distinctive astrolabe-pattern dial, and connection to Seiko’s marine conservation and underwater archaeology efforts make the SLA065 a particularly interesting collectible within the modern Prospex lineup.

Reference: SLA065

Dated: 2025

Limited: 1300 Pieces

Bezel Aligns

Bracelet: Blue Seiko Silicone

Case Size: 41.3mm x 13.1mm Thickness x 47.6mm Lug to lug

Lug Width: 20mm

Case Metal: Stainless Steel

Movement: 8L35 - Automatic

Functions: Hours, Minutes, Seconds, date

Box and Papers: Box and Papers

Crystal: Sapphire

Bracelet size: 8”

Case has little to no wear. Straps have no wear. Dial, hands, and crystal have no wear.

Seiko's history began in 1881 when Kintaro Hattori opened a watch shop in Tokyo. In 1892, he established Seikosha, a factory for producing wall clocks. The company quickly progressed, creating Japan's first wristwatch, the Laurel, in 1913. Despite setbacks like the Great Kanto Earthquake of 1923, Seiko persevered, launching its first watch under the Seiko brand name in 1924.

The post-World War II era saw Seiko's rapid growth and innovation. They introduced Japan's first automatic wristwatch in 1956 and launched the prestigious Grand Seiko line in 1960. Seiko achieved international recognition for accuracy in 1968, winning a Geneva Observatory competition. 

The company made a name for its divers in 1965 with the introduction of their first professional dive watch, the 62MAS. This was followed by the iconic 6159-7001 in 1968, which was water-resistant to 300 meters. Seiko gained international recognition in 1975 with the release of the 6159-7010, nicknamed the "Tuna Can" due to its distinctive case shape. In 1969, they revolutionized the industry with the Astron, the world's first quartz wristwatch, ushering a new era of watchmaking that would send waves across the industry through the 70s and 80s. From its humble beginnings to becoming a global watchmaking giant, Seiko's history is characterized by resilience, technological advancement, and a commitment to precision.