Hands On: Tudor Black Bay Chrono 39 “Bumblebee”

Tudor surprised with an off-season launch in the form of the Black Bay Chrono 39 “Bumblebee”. Coming just two months after Watches & Wonders 2026, the Bumblebee is one of the brand's outstanding debuts for the year (so far), alongside the atypical Monarch. The Bumblebee is essentially a scaled-down version of the original Black Bay Chrono, which was excellent but half a size too large. Now it's almost just right, but unquestionably good enough, especially since the downsized chronograph still retains the same high-spec movement and affordable price tag. Initial thoughts I'm a fan of the Black Bay Chrono; I own two earlier iterations of the model. Tudor got everything right with those, except for the size, which was a little too big for the design. The Black Bay Chrono 39 scales it down noticeably, enough that the watch is just right. The case is still a little thick (inevitably due to the movement), but the overall package has been refined to a point where it's difficult to improve it much more, especially with the constraints of price and the MT5813 movement. The MT5813 is probably the top movement in this price range in terms of features and construction, but it is relatively thick. Still, the thickness is forgivable given the quality of the movement and the price. I certainly hope Tudor rolls out new variants of this chronograph as yellow is not for me, but I rate this highly in terms of proportions, wearability, and of course value. At US$6,725, the Black Bay Chrono 39 offers arguably the best value in the sub-US$10,000 sports chronograph category. Mellow yellow The Bumblebee adopts the familiar Black Bay Chrono look, just a little smaller. The dial is essentially the same as the earlier generation, but proportionately smaller. As with other brightly coloured Black Bay Chrono dials, this dial is subtly grained with a texture that is visible only up close. It's strikingly high contrast with the blackened hour markers and hands being a nice touch for colour matching. The case continues the same-but-smaller format. The sapphire crystal is noticeably domed, while the bezel is steel with an aluminium insert. For a watch like this, I prefer the matte, no-frills look of an aluminium insert over ceramic, which will inevitably look more sophisticated and expensive. Though the bezel is decidedly low-tech given ceramic or sapphire inserts are now the norm, even for inexpensive watches, it does have charm, especially since the Black Bay Chrono is a designed rooted in 20th century sports watches. The Bumblebee retains almost everything of the earlier generation, except for the case size. It's now 39 mm wide and 13.1 mm high, compared to 41 mm by 14.4 mm for the preceding model (which is already thinner than the inaugural version). This is the result of shrewd revamping of the case construction, which was accomplished without changing the movement or water resistance. The reduction in size and height is instantly evident, even at the distance. The 41 mm chronograph is big enough that its size is apparent at arm's length. In contrast, this has a just-right size that fits the retro design. That said, the thickness of the case is still discernible. Though it's now thinner, the reduced diameter makes the case height more obvious. The case is not excessively tall, but it would work much better at a millimetre less. The primary limitation for the size of the Black Bay Chrono is the MT5813 movement inside. It's 30.4 mm wide and 7.23 mm, so it's similar to the Rolex Daytonas cal. 4131 in terms of diameter, but substantially taller. The cal. 4131 is 30.5 mm wide but only 6.5 mm high. This explains the dimensions of the Black Bay Chrono, and the Bumblebee is probably as thick as the model will get barring a new movement (which is certainly in the works). The MT5813 is based on the Breitling B01; Tudor acquired the rights to the design from Breitling, but reworked the construction and now produces it in-house at Kenissi, the movement manufacture majority owned by Tudor. The MT5813 is industrial but as good as it gets for a movement in its class. Amongst its upgrades are a free-sprung balanced paired with a silicon hairspring, plus all of the expected features of a modern chronograph, namely a column wheel and vertical clutch. While it is already very good, the MT5813 is no doubt in place only until Tudor rolls out its own chronograph movement, which is an inevitability. That will almost certainly be thinner and perhaps shared with other brands that rely on Kenissi movements. Key facts and price Tudor Black Bay Chrono 39 “Bumblebee” Ref. 79310N Diameter: 39 mm Height: 13.1 mm Material: Steel Crystal: Sapphire Water resistance: 200 m Movement: MT5813 Functions: Hours, minutes, seconds, date, and chronograph Winding: Automatic Frequency: 28,800 vibrations per hour (4 Hz) Power reserve: 70 hours Strap: Steel bracelet Limited edition: No Availability: Now at Tudor boutiques and retailers Price: US$6,725 before taxes For more, visit Tudorwatch.com.