Seiko Prospex Sea GMT 60th Anniversary Limited Edition SPB509
Seiko Prospex 1968 Heritage Diver’s GMT “60th Anniversary” (SPB509)
Marking sixty years since Seiko’s pioneering dive watch debut, the SPB509 reinterprets the iconic 1968 high‑beat diver with modern innovations. Limited to 6,000 pieces and bearing a unique serial number on the caseback, this rugged timepiece features a 42 mm stainless steel case with super‑hard coating, a deep‑blue dial with an embossed wave pattern inspired by classic “wave mark” symbolism, and a ceramic‑insert unidirectional bezel. Equipped with the automatic Calibre 6R54 offering 72‑hour power reserve and independent GMT functionality, it’s water‑resistant to 300 m and fitted with a three‑fold secure clasp with slide adjuster for comfort—an ideal blend of heritage, utility, and craftsmanship.
Information:
New: Seiko Prospex Sea GMT 60th Anniversary Limited Edition SPB509
Reference: SPB509
MSRP: $1,750
Limited: 6000 Pieces
Bezel Aligns
Strap: Stainless Steel Bracelet
Case Size: 42mm x 13.3mm Thickness 48.6mm Lug to Lug
Lug Width: 20mm
Case Metal: Stainless Steel
Movement: 6R54 - Automatic
Functions: Hours, minutes, seconds, date, GMT
Box and Papers: Box and Papers
Crystal: Sapphire
Bracelet size: 7.5”
Condition: New
History of Seiko Watches
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.
