Tudor Black Bay Chrono 39 "Bumblebee" (Ref. M79310N-0001): Der Chronograph, auf den das Handgelenk gewartet hat
Some watches arrive with fanfare.
And some watches simply settle an old score.
The Black Bay Chrono 39 “Bumblebee” clearly belongs to the second category. For years, collectors kept repeating the same phrase, almost like a ritual: “Great chronograph, but far too large for me.”
Tudor listened.
The result is a watch that comes in signal yellow but quietly does what has been requested for the longest time: become smaller.
The History of the Black Bay
To understand why this update matters, it is worth looking back. In 2012, Tudor introduced the Heritage Black Bay at Baselworld, reference 79220R, a tribute to the brand’s Submariner models from the 1950s through the 1970s, with domed sapphire crystal, a gilt dial, and the distinctive “Snowflake” hands that defined Tudor dive watches between 1969 and the early 1980s. The Black Bay was not merely a revival, but a reinterpretation that combined vintage design language with modern technology, promptly winning the “Revival” prize at the Grand Prix d’Horlogerie de Genève in 2013. In the years that followed, the collection grew into its own ecosystem: different dial colors, the Fifty-Eight as a more compact 39 mm version, GMT models, and finally, in 2017, the first Black Bay Chrono, Tudor’s first chronograph with an in-house movement, the MT5813 based on the Breitling B01. That first chronograph measured 41 mm in diameter, 14.4 mm in height, and 49.9 mm from lug to lug. A serious watch in every respect, but also one that quickly reached its limits on slimmer wrists.
The New 39 mm Approach
This is exactly where the Bumblebee comes in. Introduced in summer 2026 as part of the “Daring Watches” collection, which also includes sibling models in Miami Pink and Flamingo Blue, reference M79310N-0001 brings the chronograph down to 39 mm for the first time. That may sound like a small number, but in practice it is a completely different watch on the wrist. The diameter shrinks from 41 to 39 mm, the height from 14.4 to 13.1 mm, and the lug width from 22 to 20 mm. Most noticeable, however, is the lug-to-lug length: it drops from 49.9 to 47 mm. On a chronograph whose pushers, sub-dials, and bidirectional rotor traditionally require space, this is not a cosmetic exercise but genuine miniaturization work.
The yellow dial—the reason the watch immediately earned its nickname—is matte, high-contrast, and anything but understated. Two black sub-dials at 3 and 9 o’clock, along with a date window at 6 o’clock, follow the layout of the very first Tudor chronographs. The Snowflake hands, blackened here for optimal contrast against the yellow, are filled with Super-LumiNova and remain easy to read despite the reduced surface area. The bezel is fixed, with a black anodized aluminum insert and a silver scale. The case itself, made of 316L steel, combines polished and satin-finished surfaces, and features screw-down pushers at 2 and 4 o’clock as well as a screw-down crown. Water resistance remains rated at 200 meters.
The Caliber
Under the hood, the in-house MT5813 movement continues to power the watch, identical to the one used in the larger 41 mm model. It is a column-wheel chronograph movement with vertical coupling, automatic winding via a bidirectional rotor, as well as hand-winding and a stop-seconds function. It operates at 28,800 vibrations per hour, offers 70 hours of power reserve, has 47 jewels, and is COSC-certified with a rate deviation of -2/+4 seconds per day. The fact that Tudor did not develop a scaled-down version for the smaller case, but instead integrated the full in-house movement unchanged, is remarkable and shows that the reduction in size was a matter of case construction, not movement technology.
On the Wrist
This is where the Bumblebee’s real appeal lies. At 41 mm with almost 50 mm of lug-to-lug length, it is simply too much watch for many wrists—we have to be honest about that, even if chronographs have traditionally been allowed to be more generous in size than time-and-date watches. The 39 mm version, by contrast, hits a sweet spot that appeals to a much broader audience: wrists between roughly 15 and 18 centimeters that often looked overwhelmed by the 41 mm model cope noticeably better with the 47 mm lug-to-lug length. The reduced height of 13.1 mm also helps the watch slip beneath a shirt cuff, something the 14.4 mm-tall original rarely managed. The result is a chronograph silhouette that finally works as an everyday watch, not merely as a statement piece for broader wrists.
Conclusion
The Bumblebee is a new chapter in the Black Bay Chrono story.
Those who loved the 41 mm chronograph but never truly wore it comfortably now get exactly what was missing: the same technical substance, the same in-house movement, the same Snowflake DNA, packaged in a case that actually fits the wrist instead of growing beyond it. The yellow dial will not appeal to everyone, and that is not the point. The 39 mm size is the real message of this watch, and it is one that will be welcomed on far more wrists than its larger sibling.
Our prediction is remarkably simple: Given the model’s foreseeable success, it probably will not be long before further versions with dials in bold, vibrant colors come to market.
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