Breitling Bentley B06 Blacksteel Black Diamond: The 50-Piece Motorsport Chronograph

Some watches announce their character through restraint. Others make no attempt to be subtle. The Breitling for Bentley B06 Blacksteel Black Diamond belongs firmly in the second category.

With its imposing case, dark exterior, mother-of-pearl dial, and diamond-set detailing, this chronograph brings together two worlds that do not always meet comfortably: motorsport-inspired engineering and luxury jewelry. It is a very different expression of Breitling from the familiar Navitimer or a traditional stainless-steel pilot's chronograph.

The appeal becomes even more specific when we look at the limited edition. An auction-documented example of reference MB0611 carries the number 5/50, confirming a 50-piece edition for that Black Diamond configuration.

But the name needs a closer look. Blacksteel describes the dark treatment applied to the steel case. Black Diamond refers to the diamond-set execution, not simply the color of the watch. Understanding that distinction is essential to understanding what makes this Bentley chronograph unusual.

Breitling and Bentley: A Different Kind of Watchmaking Partnership

Breitling's relationship with Bentley produced some of the brand's most distinctive modern chronographs. The partnership drew on the visual language of grand touring cars: broad proportions, elaborate surfaces, prominent bezels, and details inspired by automotive design.

Unlike the Navitimer, which is rooted in aviation instruments, the Bentley collection leans toward the cockpit and dashboard. The watches often use large cases, intricate dial textures, and bezel details that recall automotive hardware. They are designed to be noticed.

The B06 is one of the more mechanically interesting members of this family. Its automatic chronograph movement was developed around Breitling's B06 architecture, with an emphasis on timing and the brand's characteristic chronograph display. Depending on the exact version, the dial can include a central chronograph hand, subsidiary counters, a date display, and a variable tachymeter scale.

The Blacksteel Black Diamond edition takes that already assertive design and gives it a more dramatic finish. The dark case treatment reduces the visual brightness of the metal, while the dial and diamond setting add contrast and texture.

The result is not a discreet dress chronograph. It is a statement watch built around a motorsport-inspired identity.

What “Blacksteel” Actually Means

Blacksteel is Breitling's name for a dark surface treatment applied to a steel case. It does not mean the watch is made from a solid black metal, and it should not be confused with a case manufactured entirely from black ceramic.

Breitling's Blacksteel watches use a coating associated with diamond-like carbon, commonly abbreviated DLC. This treatment gives the steel a dark appearance and can improve surface hardness and resistance to everyday wear. It is not indestructible, however. A sufficiently hard impact or deep scratch can damage the finish, and exposed steel may become visible beneath the coating.

That matters when buying a pre-owned example. Inspect the case edges, lugs, bezel, and areas around the pushers for chips or wear. A dark-coated case can look excellent when intact, but refinishing it correctly is not the same as polishing a conventional stainless-steel watch.

For collectors, the coating is part of the model's identity. It gives the large Bentley case a more technical appearance and creates a strong contrast with the reflective surfaces of the dial and diamonds.

What “Black Diamond” Actually Means

The phrase Black Diamond can be misunderstood because it sounds like a reference to the dial color or the dark case treatment. In this watch's documented configuration, the important distinction is the diamond setting.

Auction records describe the MB0611 Black Diamond example as having a diamond-set case and a mother-of-pearl dial. That makes it materially different from an ordinary Blacksteel B06 with a dark dial and no diamond setting.

The diamonds add a jewelry-like element to a watch whose proportions and dial layout are otherwise firmly rooted in the world of motorsport. The contrast is deliberate: dark-coated metal provides the visual framework, while the stones introduce flashes of light across the case.

When inspecting one, do not assume that every dark MB0611 is the same limited edition. Breitling produced other B06 Blacksteel watches with different dials, straps, and edition details. Confirm the case reference, serial number, diamond setting, and accompanying paperwork before concluding that a particular watch belongs to the 50-piece series.

It is also worth separating factory originality from aftermarket modification. If the diamonds are central to the value being claimed, ask for documentation that supports the original configuration. A watch that has been customized after leaving the factory should not automatically be treated as equivalent to a factory-set limited edition.

Why Only 50 Pieces?

The 50-piece figure is a major part of this particular Black Diamond configuration's collector appeal. An auction-documented example of the Breitling for Bentley Midnight Dark Carbon B06, reference MB0611, is numbered 5/50. The record describes a steel case with a dark PVD finish, diamond setting, and a mother-of-pearl dial.

The numbered edition gives the watch a specific place within the broader Bentley B06 family. It is not simply a common B06 with a dark case; the documented example combines a distinctive material treatment, diamond-set detailing, and a limited production number.

That said, rarity should be interpreted carefully. The wider MB0611 reference appears in other configurations and production runs, including Blacksteel models without the same diamond-set execution. The reference alone does not establish that a watch is one of the 50 Black Diamond examples.

The caseback engraving and supporting documents are therefore important. Look for the actual edition number, then confirm that the dial, case, and setting correspond to the version being advertised.

A low production number can make a watch more interesting to collectors, but it does not guarantee appreciation. Condition, authenticity, originality, service history, and the asking price still determine whether a particular example makes sense to buy.

The Mother-of-Pearl Dial: A Different Kind of Drama

The mother-of-pearl dial is one of the defining visual details of the documented Black Diamond configuration. Rather than presenting a flat black surface, mother-of-pearl reflects light differently as the angle changes. Its appearance can shift from pale and silvery to darker, more iridescent tones depending on the material and lighting.

That changing surface creates an interesting contrast with the dark case. The Blacksteel finish absorbs much of the surrounding light, while the dial and diamonds reflect it. The result is more layered than an all-black chronograph.

Mother-of-pearl also means that no two natural surfaces necessarily look identical. Small variations in color and iridescence are part of the material's character, so photographs taken under different lighting can make the same watch appear quite different.

For a collector, that is part of the appeal. The watch is not relying on a simple monochromatic dial to create its identity. It combines the dark case, the luminous dial surface, the chronograph registers, and the diamond setting into a more elaborate visual package.

Inside the Watch: Breitling Caliber B06

The Bentley B06 is an automatic mechanical chronograph. It is designed to measure elapsed time while also functioning as a conventional timekeeper, with the automatic winding system using the motion of the wrist to replenish the mainspring.

The B06 movement is associated with a 70-hour power reserve and a high-frequency operating rate of 28,800 vibrations per hour. The movement is also known for its chronograph architecture and its use of a variable tachymeter function on relevant Bentley B06 models.

That tachymeter function is a particularly appropriate feature for a watch developed around automotive themes. A tachymeter scale can be used to calculate average speed over a known distance when operated according to the scale's intended method. The rotating bezel and dial layout give the watch a distinctly instrument-like character despite its decorative elements.

Exact movement specifications can vary across the broader B06 family, so buyers should check the documentation for the specific MB0611 variant rather than assume every watch with a B06 label has identical features. For this limited edition, the case condition and originality are just as important as whether the movement starts and stops correctly.

Watch Specifications

• Model: Breitling for Bentley B06 Blacksteel Black Diamond
• Reference: MB0611
• Case material: Stainless steel with a dark PVD/Blacksteel treatment
• Case diameter: Approximately 49mm
• Dial: Mother-of-pearl in the documented Black Diamond example
• Diamond setting: Diamond-set case, as described in the auction record
• Movement: Breitling Caliber B06, automatic chronograph
• Power reserve: Approximately 70 hours, according to published B06 specifications
• Frequency: 28,800 vibrations per hour in documented B06 configurations
• Functions: Time display, chronograph, date, and tachymeter/slide-rule features depending on the exact version
• Crystal: Sapphire on documented MB0611 examples
• Edition: 50 pieces for the documented Black Diamond configuration
• Numbering: An auction example is documented as 5/50

These specifications describe the documented Black Diamond example and the broader B06 platform. Exact details should be verified against the individual watch, especially because the MB0611 reference also appears in other Blacksteel configurations.

Who Is This Watch For?

The B06 Blacksteel Black Diamond is for a collector who wants a large, visually assertive chronograph and is comfortable with a design that blends mechanical watchmaking with jewelry-like details.

It makes the most sense for someone who appreciates the Bentley partnership, enjoys oversized watches, and wants something more unusual than a conventional steel chronograph. The combination of Blacksteel, mother-of-pearl, and diamonds creates a look that is difficult to confuse with a standard pilot's watch.

It may be less suitable for someone who wants a versatile everyday watch that slips easily under a cuff. At approximately 49mm, the case has substantial wrist presence. The dark coating also requires care, particularly if the watch is worn frequently around hard surfaces.

Collectors who prefer traditional tool-watch restraint may find the diamonds and mother-of-pearl too decorative. Others will see those same details as the reason to choose this edition over a standard B06.

What Collectors Should Check Before Buying

• Confirm the exact reference. MB0611 is used across more than one Bentley B06 configuration. Do not rely on the reference alone to establish the 50-piece Black Diamond edition.
• Verify the XX/50 numbering. Inspect the actual caseback and compare the number with the documentation. Do not accept a generic listing description as proof.
• Check the diamond setting. Ask whether the setting is factory-original and request supporting paperwork or a specialist assessment.
• Inspect the Blacksteel coating. Look closely at the case edges, bezel, lugs, and pusher surrounds for chips or exposed steel.
• Examine the mother-of-pearl dial. Check for damage, replacement, or inconsistencies with documented examples.
• Test the chronograph and date. Confirm that the chronograph starts, stops, and resets correctly and that the date mechanism functions as expected.
• Request service records. An automatic chronograph with multiple functions can be expensive to service. Ask for evidence of recent maintenance.
• Review the complete set. Original box, papers, chronometer certificate, and purchase records can support provenance, but accessories alone do not prove authenticity.
• Buy condition, not just rarity. A 50-piece edition is interesting, but originality, mechanical health, coating condition, and a sensible price should drive the decision.

Final Thoughts: A Bentley Chronograph With a Different Kind of Exclusivity

The Breitling Bentley B06 Blacksteel Black Diamond occupies an unusual corner of the brand's history. It combines the oversized, motorsport-inspired character of the Bentley collection with a dark-coated steel case, a mother-of-pearl dial, and diamond-set detailing.

The 50-piece edition adds scarcity, but the real point of the watch is its combination of contrasting materials and mechanical function. Blacksteel gives the case its dark identity. The diamonds provide the jewelry element. The mother-of-pearl dial changes with the light, and the automatic B06 chronograph gives the watch its mechanical purpose.

For the right collector, it is a distinctive alternative to a conventional Breitling chronograph. It is not the most understated watch in the catalogue, nor is it trying to be. Its appeal comes from the fact that it brings together automotive design, luxury detailing, and a serious mechanical chronograph in one unmistakable package.

Just remember the most important buying lesson: verify the exact edition. The MB0611 reference appears in different configurations, so the Black Diamond name and XX/50 numbering must be supported by the actual watch and its documentation.