Citizen Promaster Mechanical Diver 200M Automatic Fujitsubo Blue Dial Super Titanium™ 41 mm Bracelet Watch [NB6021-68L]

The Citizen Promaster Mechanical Diver 200M Fujitsubo NB6021-68L is one of the most historically significant modern dive watches in the Citizen collection. Inspired by the legendary Citizen Challenge Diver discovered attached to a mangrove root—known in Japan as a Fujitsubo (barnacle)—after spending years submerged in the ocean, this remarkable timepiece combines authentic dive-watch heritage with modern engineering and contemporary materials. The result is a professional-grade automatic diver that honours Citizen's past while embracing the technology demanded by today's enthusiasts. 

Crafted from Citizen's proprietary Super Titanium™, the NB6021-68L delivers exceptional durability while remaining dramatically lighter than comparable stainless-steel dive watches. Its rich blue dial, matching blue bezel, and clean professional-diver aesthetic make it equally suitable for underwater exploration, everyday wear, or inclusion within a serious watch collection.

The Legend of the Fujitsubo

The story behind the Fujitsubo is unlike any other watch in Citizen's history.

In 1983, a Citizen Challenge Diver was reportedly recovered from the ocean attached to a mangrove root after spending years submerged in harsh conditions. Remarkably, the watch was still operational. This extraordinary discovery became part of Citizen folklore and eventually inspired the creation of the modern Fujitsubo collection.

Today, the NB6021-68L serves as a tribute to that legendary story while incorporating the latest advancements in Citizen's mechanical watchmaking expertise.

In-House Calibre 9051

Powering the watch is Citizen's impressive Calibre 9051 automatic movement.

Designed specifically for modern enthusiasts, the movement operates at 28,800 vibrations per hour and offers approximately 42 hours of power reserve. One of its most impressive features is its enhanced magnetic resistance of up to 16,000 A/m, significantly exceeding the magnetic protection found in many traditional dive watches.

This makes the watch particularly well suited to modern environments filled with electronic devices, laptops, speakers, and smartphones.

Super Titanium™ Construction

One of the standout features of the NB6021-68L is its use of Citizen's proprietary Super Titanium™.

Approximately 40% lighter than stainless steel while offering significantly greater scratch resistance, Super Titanium™ provides outstanding comfort without sacrificing durability. The lightweight construction makes the watch exceptionally comfortable for daily wear while maintaining the robust feel expected of a professional dive watch. 

For owners who wear their watches daily, the difference is immediately noticeable.

Professional Dive-Watch Credentials

The NB6021-68L is not simply dive-inspired—it is built as a true professional diving instrument.

The watch complies with ISO 6425 diver's watch standards and features:

• 200-metre water resistance
• Unidirectional elapsed-time bezel
• Screw-down crown
• Highly luminous hands and markers
• Sapphire crystal
• Anti-magnetic movement protection

These features ensure reliable performance both above and below the water.

Vintage Inspiration, Modern Execution

While inspired by Citizen's historic dive watches, the Fujitsubo avoids becoming a simple vintage reissue.

The clean dial design, compact 41 mm case size, modern materials, and refined finishing create a watch that feels contemporary while preserving the character of the original Challenge Diver. The result is a dive watch that appeals equally to collectors, enthusiasts, and first-time buyers seeking an exceptional mechanical sports watch.

Why Choose the Citizen Promaster Mechanical Diver 200M Fujitsubo NB6021-68L?

• Inspired by the legendary Citizen Challenge Diver
• In-house Calibre 9051 automatic movement
• Enhanced anti-magnetic protection
• Super Titanium™ construction
• Sapphire crystal
• ISO-certified diver's watch
• 200-metre water resistance
• Lightweight and highly comfortable
• Vintage-inspired design with modern engineering
• One of Citizen's finest mechanical dive watches

Citizen Authorized Dealer

When you purchase the Citizen Promaster Mechanical Diver 200M Fujitsubo NB6021-68L from Mani Jewellers, you receive a brand-new, factory-fresh timepiece complete with original Citizen presentation box, manuals, and full manufacturer warranty coverage.

Perfect For

• Dive-watch enthusiasts
• Mechanical-watch collectors
• Buyers seeking a lightweight titanium diver
• Fans of Japanese watchmaking
• Everyday sports-watch wearers
• Collectors looking for an alternative to Tudor, Longines, Oris, and Seiko dive watches

Technical Specifications

• Model Number: NB6021-68L
• Collection: Promaster Mechanical Diver 200M Fujitsubo
• Movement: Automatic
• Calibre: 9051
• Jewels: 24
• Beat Rate: 28,800 vph
• Power Reserve: Approximately 42 Hours
• Accuracy: -10 / +20 Seconds Per Day
• Case Size: 41 mm
• Case Thickness: 12.3 mm
• Case Material: Super Titanium™
• Crystal: Sapphire Crystal
• Dial Colour: Blue
• Bezel: Blue Unidirectional Elapsed-Time Bezel
• Bracelet: Super Titanium™ Bracelet
• Crown: Screw-Down Crown
• Water Resistance: 200 Metres / 20 Bar
• Certification: ISO 6425 Diver's Watch
• Magnetic Resistance: 16,000 A/m
• Functions: Hours, Minutes, Seconds, Date
• Luminous Features: Hands and Markers
• Weight: Approximately 102 g
• Country of Manufacture: Japan
• Warranty: 5-Year Citizen International Warranty

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