Seiko Prospex Automatic Watch
SPB121J1
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Brand SeikoCollectionProspexSeriesLandModel NoSPB121J1
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MovementFeatures Compass, DateMovement AutomaticCalibre 6R35CaseCase Size 39.5 mmCase Thickness 13.2 mmCase Shape RoundCase Material SteelBezel Internal Bi-directional Rotating BezelCase Back See-through Case BackGlass Material Sapphire CrystalDialLuminosity On Hands & Hour MarkersDial Colour GreenIndexes Arabic NumeralsStrapStrap Material LeatherStrap Colour BrownClasp Type Pin BuckleBuckle/Clasp Material SteelOtherEAN `4954628232922Gender MenWater Resistance (M) 200Warranty Period 2 YearsCountry of Origin Japan
Collection Video Discover the Prospex Collection
About the Seiko Prospex Collection
Prospex collection exemplifies their dedication to producing Seiko watches tailored for professional and recreational sports. Launched with a focus on robust and precise timepieces, the Prospex range has grown from its origins as a diver's watch series into a comprehensive lineup that spans sea, land, and sky-focused models. This evolution reflects their innovative history, starting from their 1965 debut of Japan’s first diver’s watch and their legacy of pushing boundaries in sports watch design.
Design And Features
The hallmark of Prospex watches is their rugged durability and precision performance, achieved through the use of premium materials and cutting-edge movement technology. Many models boast ISO-certified diving capabilities, strong water resistance, and legibility enhancements. Seiko incorporates high-tech details like Lumibrite hands and markers for superior visibility, anti-magnetic protection, and impact resistance. Their professional models often use movements such as the automatic calibre 6R35, Spring Drive and Solar Power for unparalleled precision. Aesthetic design varies widely, blending traditional elements with bold, contemporary touches, ensuring versatility for sports and urban settings alike.
Current Iterations
The current Prospex lineup includes models like the “LX Line,” renowned for its premium build and Spring Drive movements. It stands as a pinnacle of sport-inspired luxury, featuring intricate designs and impressive functions such as GMT and chronograph capabilities. Additionally, Seiko’s Marinemaster series offers serious diver-oriented designs, while the Land and Speedtimer models expand the focus to terrestrial and racing contexts. The 1968 Diver’s Re-interpretation remains a tribute to their classic innovations, updated with modern features. These Seiko watches for women and men continue to represent the brand's unwavering dedication to creating timepieces that are both durable and adaptable, suitable for any environment or occasion.

ABOUT THE MOVEMENT
At Baselworld 2019, watches featuring the 6R35 were unveiled. The Seiko calibre 6R35 is an automatic movement from Seiko's high-performance 6R series. This movement has replaced the calibre 6R15 in certain watches, boasting a significant 20-hour increase in power reserve. While the 6R15 offers a power reserve of around 50 hours, the 6R35 extends this to approximately 70 hours. To fully wind the mainspring, the crown must be turned at least 55 times, compared to the conventional 30 times. With 24 jewels, the calibre ensures the smooth operation of all components.

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- Brand Seiko
- Reference 6R35
- Movement Automatic
- Display Analog
- Power Reserve approx. 70 hours
- Jewels 24
- Frequency 21600 bph
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