Citizen Promaster Mechanical Diver 200M Fujitsubo Automatic Black Dial Super Titanium™ 41 mm Strap [NB6021-17E]

The Citizen Promaster Mechanical Diver 200M Fujitsubo NB6021-17E is one of the most important modern releases in Citizen's mechanical watch collection. Inspired by the legendary Citizen Challenge Diver, famously discovered years later attached to a mangrove root and still functioning after prolonged exposure to the ocean, this remarkable timepiece combines authentic dive-watch heritage with cutting-edge Japanese engineering. 

Nicknamed the "Fujitsubo"—Japanese for barnacle—the watch pays tribute to one of the most fascinating stories in dive-watch history while delivering the performance expected from a modern professional diver. Crafted from lightweight Super Titanium™, powered by Citizen's in-house Calibre 9051, and built to ISO dive-watch standards, the NB6021-17E represents one of the strongest values in the modern automatic dive-watch category. 

The Legend of the Fujitsubo

Few watches possess a story as compelling as the Fujitsubo.

The original Citizen Challenge Diver that inspired this collection was reportedly found attached to a mangrove tree after years in the ocean, yet remained operational. The discovery became part of Citizen lore and ultimately inspired the development of this modern interpretation. Rather than creating a simple reissue, Citizen engineered a contemporary professional dive watch that honours the spirit of the original while significantly improving its performance. 

For enthusiasts of authentic watch history, few modern dive watches offer a more compelling backstory.

In-House Calibre 9051

Powering the NB6021-17E is Citizen's impressive Calibre 9051 automatic movement.

Operating at 28,800 vibrations per hour with a 42-hour power reserve, the movement offers excellent reliability and performance for daily wear. Most notably, it features enhanced magnetic resistance rated to 16,000 A/m, helping protect the watch from the magnetic fields commonly encountered around modern electronics, smartphones, tablets, and computers. 

For many enthusiasts, the Calibre 9051 is among the most important mechanical movements Citizen has produced in recent years.

Super Titanium™ Construction

One of the defining features of the Fujitsubo is its use of Citizen's proprietary Super Titanium™.

Approximately 40% lighter than stainless steel while offering significantly enhanced scratch resistance, Super Titanium™ provides exceptional comfort for everyday wear. The lightweight construction allows the watch to feel remarkably comfortable despite its professional-grade specifications. 

At approximately 73–75 grams, the watch wears substantially lighter than many competing dive watches in this category. 

Professional Dive Watch Credentials

The NB6021-17E is a true professional dive watch built to ISO 6425 standards.

Key features include:

• 200-metre water resistance
• Screw-down crown
• Unidirectional elapsed-time bezel
• Sapphire crystal
• Highly luminous hands and markers
• Enhanced anti-magnetic protection
• Durable polyurethane dive strap

These features ensure dependable performance whether the watch is used underwater or worn daily as a sports watch. 

Vintage Character with Modern Execution

The black dial, vintage-inspired green luminous material, embossed hour markers, and raised-pattern polyurethane strap pay tribute to the original Challenge Diver while maintaining a thoroughly modern execution. Citizen successfully balances vintage charm with contemporary performance, creating a watch that feels equally appropriate in a dive environment, the office, or a weekend getaway. 

Collector Presentation

Citizen further enhances the ownership experience by delivering the watch in an exclusive collector's dive tank presentation box, reinforcing its status as one of the most enthusiast-focused watches in the current Promaster lineup. 

Why Choose the Citizen Promaster Mechanical Diver 200M Fujitsubo NB6021-17E?

• Inspired by the legendary Challenge Diver
• In-house Calibre 9051 automatic movement
• Enhanced anti-magnetic protection
• Lightweight Super Titanium™ construction
• Sapphire crystal
• ISO-certified diver's watch
• 200-metre water resistance
• Vintage-inspired design
• Exclusive collector's presentation box
• One of Citizen's most respected modern mechanical watches

Citizen Authorized Dealer

When you purchase the Citizen Promaster Mechanical Diver 200M Fujitsubo NB6021-17E from Mani Jewellers, you receive a brand-new, factory-fresh timepiece complete with original Citizen collector packaging, manuals, and full manufacturer warranty coverage.

Perfect For

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

Technical Specifications

• Model Number: NB6021-17E
• Collection: Promaster Mechanical Diver 200M Fujitsubo
• Movement: Automatic
• Calibre: 9051
• Jewels: 24
• Beat Rate: 28,800 vph
• Accuracy: -10 / +20 Seconds Per Day
• Power Reserve: Approximately 42 Hours
• Case Size: 41 mm
• Case Thickness: 12.3 mm
• Case Material: Super Titanium™
• Crystal: Sapphire Crystal
• Dial Colour: Black
• Bezel: Unidirectional Elapsed-Time Bezel
• Strap: Black Polyurethane Strap with Raised Vintage Pattern
• Lug Width: 20 mm
• 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: 73 g
• Presentation: Exclusive Collector's Dive Tank Box
• Country of Manufacture: Japan
• Warranty: 5-Year Citizen International Warranty 

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