Seiko Prospex SPB240 MM200 Boutique Special

The Seiko Prospex SPB240 “MM200” Boutique Special Edition brings a warmer, more luxurious character to Seiko’s modern reinterpretation of its legendary 1968 professional diver. Available exclusively through selected Seiko boutiques, the SPB240 features a 42mm stainless steel case with Seiko’s Super-Hard coating, complemented by a rich sunray brown dial, cream-colored LumiBrite markers, and rose-gold-tone accents throughout the hands, indexes, and unidirectional dive bezel. The combination gives the watch a distinctly vintage appearance while retaining modern dive-watch capability. A sapphire crystal with internal anti-reflective coating, screw-down crown, date at 3 o’clock, and 200 meters of water resistance round out the package, while the three-link stainless steel bracelet includes a secure folding clasp and diving extension. The caseback is marked “SPECIAL EDITION,” distinguishing this boutique-exclusive configuration from the standard-production MM200 models.

Inside is Seiko’s automatic Caliber 6R35, a 24-jewel movement operating at 21,600 vibrations per hour and offering an impressive approximately 70-hour power reserve. The movement features both manual winding and hacking seconds, providing a significant step up in practicality from many of Seiko’s entry-level Prospex calibers. The SPB240’s design traces directly back to Seiko’s groundbreaking 1968 diver, Ref. 6159-7001, the brand’s first professional high-beat diver and an important foundation for the MarineMaster watches that followed. Often nicknamed the “MM200” by enthusiasts, the SPB240 combines that historic design language with more wearable 42mm proportions, sapphire crystal, modern movement technology, and an unusual brown-and-rose-gold color palette that makes this Boutique Special Edition one of the most distinctive versions of Seiko’s 1968 Diver’s Re-Interpretation.

Reference: SPB240

Dated: Undated

Bezel Aligns: Yes

Bracelet: Stainless Steel Bracelet

Case Size: 42mm x 12.5mm Thickness

Lug Width: 20mm

Case Metal: Stainless Steel

Movement: 6R35 - Automatic

Functions: HMS, Date

Box and Papers: Inner/outer boxes and warranty card

Crystal: Sapphire

Bracelet size: 7.5”

Case has little to no wear. Bracelet has little to 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.