Seiko Prospex 1970 Reinterpretation SLA051

The Seiko Prospex 1970 Diver’s Modern Re-interpretation Ref. SLA051 is a premium tribute to one of the most recognizable dive watches in Seiko’s history, combining the iconic design of the original 1970 Ref. 6105 with contemporary Japanese watchmaking. Introduced in 2021, the SLA051 draws inspiration from the legendary diver worn by Japanese adventurer Naomi Uemura during his extraordinary 12,000-kilometer solo dog-sled expedition from Greenland to Alaska between 1974 and 1976. Its distinctive 44mm stainless steel case features the original’s asymmetrical cushion-shaped design, with an extended case flank protecting the screw-down crown at 4 o’clock. The case measures just 13mm thick and features Seiko’s protective Super-Hard coating, with beautifully polished sides and brushed surfaces. Its striking charcoal-grey dial incorporates an intricate textured pattern inspired by rugged mountainous terrain, complemented by luminous hour markers, broad hands, and a discreet date window between 4 and 5 o’clock. A black unidirectional diving bezel, dual-curved sapphire crystal with anti-reflective treatment, and 200 meters of water resistance reinforce its professional diving credentials. The watch is fitted with a matching five-row stainless steel bracelet featuring a secure folding clasp and diving extension.

Inside is Seiko’s high-grade automatic Calibre 8L35, a sophisticated mechanical movement developed specifically for the brand’s premium professional dive watches. Assembled by skilled watchmakers at the Shizukuishi Watch Studio in northern Japan, the 26-jewel movement operates at 28,800 vibrations per hour and delivers approximately 50 hours of power reserve. It features manual winding, hacking seconds, and a practical date complication, combining reliable mechanical performance with traditional Japanese craftsmanship. The SLA051 continues the legacy of Seiko’s original 1970 diver, a watch whose distinctive case architecture and exceptional durability helped establish the brand’s reputation for producing instruments capable of surviving some of the world’s most demanding environments. Released alongside the limited-edition blue-dial SLA049 commemorating Naomi Uemura’s 80th birthday, the charcoal-grey SLA051 offers a more faithful interpretation of the original 1970 color scheme. Unlike its limited-edition counterpart, the SLA051 was introduced as a regular-production model, making its appeal rooted in its historical significance, premium construction, and exceptional movement. With its distinctive asymmetrical case, beautifully textured grey dial, high-grade Calibre 8L35, and direct connection to Seiko’s legendary exploration heritage, the SLA051 represents one of the finest modern interpretations of the iconic 1970 diver.

Reference: SLA051

Strap: Stainless Steel Bracelet

Case Size: 44mm x 13mm Thickness

Lug Width: 20mm

Case Metal: Stainless Steel

Movement: 8L35 - Automatic

Functions: HMS, Date

Box and Papers: Inner/outer boxes, and warranty card

Crystal: Sapphire

Bracelet size: 7.75”

Case has light normal micro wear, with nothing notable. Bracelet has minimal 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.