Seiko Prospex 3rd Gen"Sumo" Diver's 200m Automatic Black Dial Sapphire Glass Watch SPB101J1

Items Description

The Seiko Prospex 3rd Gen"Sumo" Diver's 200m Automatic Black Dial Sapphire Glass Watch SPB101J1 is a purpose-built mechanical dive watch designed for scuba enthusiasts and collectors who value robust construction and reliable automatic performance. As part of Seiko's legendary Prospex family, this third-generation Sumo combines a substantial 45mm stainless steel case with a striking black dial, delivering a bold wrist presence that remains legible in the darkest underwater environments.

 

The SPB101J1 is powered by the modern Caliber 6R35 automatic movement, which offers a substantial 70-hour power reserve alongside manual winding capability. Its sapphire crystal and unidirectional rotating bezel reinforce its credentials as a serious dive instrument, while the screw-down crown and screw case back ensure water resistance to 200 metres. The black dial, hands, and markers provide a monochromatic aesthetic that pairs versatility with professional-grade tool-watch character.

 

Key Advantages of the Seiko Prospex 3rd Gen"Sumo" Diver's 200m Automatic Black Dial Sapphire Glass Watch SPB101J1

 

1. Automatic Caliber 6R35 Movement

At the heart of the SPB101J1 lies Seiko's Caliber 6R35, a reliable automatic movement that represents a clear upgrade over earlier Sumo generations. This movement delivers both practical performance and mechanical character for daily wear and extended dives alike.

 

• 70-Hour Power Reserve: The mainspring stores enough energy to keep running for approximately three days when fully wound, so the watch can sit unworn over a weekend and still maintain accurate time on Monday.
• Manual Winding Support: The crown allows manual winding, giving wearers the option to quickly top up the power reserve before a dive or a day out.
• Accuracy Range: The movement operates within an accuracy range of +25 to -15 seconds per day, which is consistent with Seiko's specifications for this caliber.
• Automatic Operation: The self-winding mechanism uses natural wrist motion to keep the rotor turning, eliminating the need for batteries or regular winding in normal use.

 

2. Robust 200-Metre Diver's Construction

Built to meet the demands of professional diving use, the SPB101J1 features a case architecture that prioritises water resistance and impact durability. Every element of the case has been engineered with underwater reliability in mind.

 

• Screw-Down Crown: The threaded crown locks securely against the case, preventing water ingress even at depth.
• Screw Case Back: The solid steel case back screws down tightly, further reinforcing the watch's water-tight seal.
• 200-Metre Rating: Certified for water resistance to 200 metres (660 feet), this watch is suitable for recreational scuba diving, snorkelling, and all water-based activities.
• Unidirectional Rotating Bezel: The 60-minute bezel rotates only counterclockwise, preventing accidental timing adjustments that could shorten a planned dive.

 

3. High-Visibility Black Dial with Lumibrite

The black dial of the SPB101J1 is designed for maximum legibility in low-light and underwater conditions. Seiko's Lumibrite coating on the hands and markers absorbs light energy and emits it gradually, providing a bright glow that lasts for hours after exposure to sunlight.

 

• Clear Layout: Large, angular hour markers and bold hands create a high-contrast display that is easy to read at a glance.
• Date Window: A date display sits at 3 o'clock, adding everyday practicality to the dive-focused design.
• Anti-Reflective Sapphire Crystal: The scratch-resistant sapphire glass features anti-reflective coating on the inner surface, reducing glare while maintaining excellent scratch protection.
• Matte Black Finish: The dial's matte texture minimises reflections, keeping the display clean even under direct sunlight or dive lights.

 

4. Distinctive Third-Generation Sumo Design

The third-generation Sumo introduced a refined silhouette that retains the model's celebrated "heavyweight" character while improving proportions and wearability. The SPB101J1 Black variant showcases this design language in its most understated and versatile form.

 

• 45mm Case Diameter: A substantial case width gives the watch a commanding presence on the wrist, typical of the Sumo line's reputation for bold proportions.
• 188g Total Weight: The stainless steel construction provides a solid, reassuring heft that feels appropriate for a professional dive tool.
• Black Accents Throughout: The black dial is matched by black hands and markers, creating a cohesive monochrome look that pairs easily with any strap or outfit.
• Slimmer Lug Profile: The third-generation case reshapes the lugs for a more comfortable fit compared to earlier Sumo models, reducing bulk while maintaining durability.

 

5. Reliable Tool-Watch Features for Everyday Use

Beyond its dive-specific capabilities, the SPB101J1 offers practical features that make it a dependable companion for daily wear. The combination of rugged construction and thoughtful details ensures the watch performs well in a variety of situations.

 

• Sapphire Crystal: The synthetic sapphire glass resists scratches from daily wear, keeping the dial clear and protected for years of use.
• Lumed Bezel Marker: A luminescent pip at the 12 o'clock position on the bezel helps with timing during low-light conditions, such as early morning dives or nighttime navigation.
• Water Resistance for All Conditions: The 200-metre rating covers not only diving but also swimming, showering, and exposure to rain, making it suitable for any activity.
• Automatic Longevity: The 6R35 movement is designed for long-term reliability, with a robust construction that can be serviced by watchmakers when maintenance is eventually required.

 

The Seiko Prospex 3rd Gen"Sumo" Diver's 200m Automatic Black Dial Sapphire Glass Watch SPB101J1 is best suited for recreational divers and mechanical watch enthusiasts who want a substantial, reliable dive watch with modern automatic performance. Its combination of 200-metre water resistance, a 70-hour power reserve, and the timeless appeal of a black dial make it a practical choice for those who value both function and tradition in their timepiece.

Specifications of Seiko Prospex 3rd Gen"Sumo" Diver's 200m Automatic Black Dial Sapphire Glass Watch SPB101J1

Brand Name	Seiko
Model number	SPB101J1
Part Number	SPB101J1
Item Shape	Round
Dial window material type	Sapphire
Clasp	Three-fold clasp with secure lock , push button release with extender
Case material	Stainless Steel
Case diameter	45 millimeters
Case Thickness	13 millimeters
Band Material	Stainless Steel
Band length	Men's Standard
Band width	22 millimeters
Band Color	Silver
Dial color	Black
Bezel function	Unidirectional
Calendar	Date
Movement	Automatic with manual winding capacity
Water resistant depth	200 Meters
Display Type	Analog

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Specifications
[Brand Name ]	Seiko
[Model number ]	SPB101J1
[Part Number ]	SPB101J1
[Item Shape ]	Round
[ Dial window material type ]	Sapphire
[Clasp ]	Three-fold clasp with secure lock , push button release with extender
[Case material ]	Stainless Steel
[Case diameter ]	45 millimeters
[Case Thickness ]	13 millimeters
[Band Material ]	Stainless Steel
[Band length ]	Men's Standard
[Band width ]	22 millimeters
[Band Color ]	Silver
[Dial color ]	Black
[ Bezel function ]	Unidirectional
[ Calendar ]	Date
[ Movement ]	Automatic with manual winding capacity
[ Water resistant depth ]	200 Meters
[Display Type ]	Analog

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