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Ever since its debut in 2009, the B01 automatic chronograph movement has been inseparably linked to the illustrious Breitling name. Developed and produced in-house, the caliber ranks among the most powerful and innovative movements in its class. What many people don't know: the Swiss manufacture Tudor also relies on the power of this renowned movement. We explain the technical features of the chronograph movement, present its various versions, and show which models it powers.
Breitling Becomes a Manufacture: Why the B01 Matters So Much
When Breitling unveiled the B01 in April 2009 as its first in-house movement in recent company history, it caused a huge stir. Just in time for the 125th anniversary of the manufacture, founded in 1884, a long-running and costly project bore fruit – one that many enthusiasts and experts had long hoped for from the Grenchen-based luxury brand.
At last, the maker with the winged B would live up to its prominent reputation, people said at the time. In the 21st century, in a world full of in-house movements from Rolex or Omega, first-rate cases and big names like the Navitimer 1 or Chronomat were no longer enough to meet the rising expectations placed on the Swiss luxury segment. So was this the big leap? The burden on the shoulders of the Breitling B01 caliber could hardly have been heavier.
In-House, Column Wheel, 70-Hour Power Reserve: The Key Facts
The only thing greater than the pressure was the confidence with which the movement exceeded every expectation in 2009. At the heart of the chronograph is a classic column wheel, which controls start, stop, and reset, and works with an innovative friction clutch that couples the chronograph to the power source in an energy-efficient way.
Another highlight is a patented self-centering system whose heart-piece lever is responsible for resetting the minute counter and the chronograph hand. At the same time, it reduces effort during production. Given the high volumes, production is not done by hand but is largely handled by modern machinery. Otherwise, watch prices below the €10,000 mark would not be feasible.
When it comes to power reserve, the caliber offers a generous 70 hours, paired with a classic frequency of 28,800 vibrations per hour (4 Hz). As a result, the chronograph hand ticks eight times every second. Like all Breitling movements, the in-house caliber must pass a COSC precision test before it is cased.
[box type="note" align="" class="" width=""]Speaking of casing: with a diameter of 30 millimeters and a not-to-be-underestimated height of 7.2 millimeters, this caliber won't win any slimness contests.[/box]The considerable height stems from a modular construction that makes servicing and repairs much easier, since the chronograph components can be separated from the base movement without difficulty.
Which Watches Use the Breitling B01 Caliber?
Since the first movement of its kind was unveiled, the family of Breitling in-house movements has grown dramatically.
[box type="info" align="" class="" width=""]All in-house movements, with designations ranging from B02 to B25, are technically based on the original caliber and feature various modifications compared with the base movement.[/box]Before we take a closer look at the derivatives, let's focus on the original movement, which is found in a wide range of models. Its most prominent use is probably in the Navitimer 1, whose predecessors have shaped our idea of the ideal pilot's watch like no other chronograph since 1952. The sporty Chronomat B01 42 has also relied on the power of the in-house movement since 2020, as have the dive watches of the Superocean Heritage II Chronograph line. If you want to get to know Breitling's most elegant side, buy a classic Premier – where you'll also find the B01 movement.
Important: in many collections, the Swiss luxury brand pursues a kind of "two-tier policy" that gives customers the choice, for a given model, between a sourced caliber and the in-house flagship.
If, for example, you buy a Navitimer 1 B01 Chronograph 43 (Ref. AB0121211B1A1) for €8,350, you pay a premium of €2,200 over the same model with the ETA-based caliber B13 (Ref. A13324121B1A1). Contrasting subdials and a sapphire caseback are typical features of a version with the in-house movement.
B03, B04, B05: The Variants
When a complication or special feature is added to the standard Breitling B01 caliber, its designation changes. Here are the most important variants:
- B02: Hand-wound version of the Breitling B01 for models with a 24-hour dial, e.g. the former Cosmonaute line.
- B03: Chronograph with a second seconds hand for timing intermediate intervals ("rattrapante" or split-seconds). Used in all Navitimer models bearing the Rattrapante name.
- B04: A version with an additional GMT complication (second hour hand). Found in a wide range of models, from the Chronomat to the Navitimer.
- B05: The standard movement for the now-discontinued Transocean collection with world time function. Also found in the Breitling for Bentley B05 Unitime.
- B09: Hand-wound with a bicompax layout, used in the current dress watches of the Premier collection.
- B15: New development for the Premier Duograph with split-seconds function and bicompax layout.
- B25: Current movement of the Premier Datora with full calendar.
A New Role in the Tudor Black Bay Chrono
Alongside the Superocean Heritage II, Chronomat, and the other luxury watches with the winged B on the dial, Rolex's sister brand Tudor also benefits from the proven power of this caliber. A gift to the competition? Not at all – it's actually a swap, in which the B01 movement goes to Geneva and Tudor's in-house automatic caliber MT5612 goes to Grenchen.
The B01 makes its big appearance in the brand-new Tudor Black Bay Chrono, whose list price of €4,550 makes it by far the most affordable route to Breitling's famous movement. Here it is renamed MT5813, replaces the familiar 30-minute counter with a 45-minute scale, and reveals clear changes in finishing beneath the sapphire caseback. Another difference lies in the regulating organ: while Breitling's models use a traditional index regulator and a balance cock, the Tudor Black Bay Chrono features a modern Glucydur balance (recognizable by its golden color) with variable inertia.
Incidentally, the rest of the Black Bay Chrono package is highly appealing too. Besides the stainless steel case with a moderate 41-millimeter diameter, we like the contrasting subdials, the black tachymeter bezel, and the 200-meter water resistance. Two-tone models with yellow gold are also available.
[box type="success" align="" class="" width=""]If you've always dreamed of a Breitling B01 caliber but could never live with the movement's lofty prices, the Tudor Black Bay Chrono makes a great companion.[/box]