Tudor Black Bay Chrono 39 'Bumblebee': A Smaller Chronograph With Big Aspirations
Tudor Black Bay Chrono 39 'Bumblebee': A Smaller Chronograph With Big Aspirations
After years of requests from collectors, Tudor has finally delivered a smaller chronograph. The Black Bay Chrono 39 "Bumblebee" (reference M79310N-0001) brings the brand's proven chronograph platform down to 39mm — making it the most wearable Tudor chronograph in the modern catalog. Launched in mid-2026, this black-and-yellow dialed timepiece is the first of what promises to be a growing family of compact chronographs.
Why Size Matters: 39mm vs. 41mm
The original Black Bay Chrono's 41mm case was always a point of contention. While the Rolex Cosmograph Daytona measures 40mm and just 11.9mm thick, the Black Bay Chrono 41 was 14.4mm thick — a significant difference on the wrist. The new 39mm version addresses this directly:
- Case diameter: 39mm (down from 41mm)
- Case thickness: 13.1mm (down from 14.4mm)
- Lug-to-lug: 47mm
The 1.3mm thickness reduction is particularly impressive given that Tudor didn't develop a new movement for this watch. The Black Bay Chrono 39 uses the same relatively thick MT5813 automatic chronograph movement found in the 41mm model. Tudor achieved the slimmer profile through clever case architecture, including recessed bracelet integration and refined polished chamfers that visually reduce bulk.
The 'Bumblebee' Dial
The inaugural Black Bay Chrono 39 wears a bold black and yellow color scheme that Tudor has added to its "Daring Colors" family, alongside the existing pink and light-blue dial variants of the 41mm model. The black dial features yellow accents on the chronograph subdials and hands, creating a sporty, high-contrast look that is unmistakably Tudor.
The familiar "snowflake" hour hand is paired with a Submariner-style layout of lume-painted applied hour markers, ensuring excellent legibility in all conditions. A tachymeter scale is printed on the black anodized aluminum bezel insert.
Movement: MT5813 Chronograph
The calibre MT5813 is based on the Breitling B01 architecture — a proven, column-wheel chronograph movement that Tudor has refined with its own silicon hairspring and finishing. This is a thick movement (7.23mm), but it delivers excellent reliability and performance:
| Specification | Details |
|---|---|
| Caliber | MT5813 Automatic Chronograph |
| Architecture | Breitling B01-based, column wheel, vertical clutch |
| Certification | COSC Chronometer + Tudor in-house testing |
| Accuracy | -2/+4 seconds per day |
| Power Reserve | 70 hours |
| Frequency | 28,800 bph (4Hz) |
| Chronograph | 45-minute counter, central seconds |
| Special Features | Silicon hairspring, date at 6 o'clock |
Bracelet and Wearing Experience
The Black Bay Chrono 39 ships on a three-link Oyster-style bracelet with Tudor's T-fit sliding microadjust system — a welcome addition that makes on-the-fly sizing effortless. The bracelet tapers nicely and wears comfortably, with the end-links sitting more flush with the lugs to maintain the slimmer profile.
Notably, the 39mm bracelet omits the decorative side rivets found on the 41mm model's bracelet, resulting in a cleaner, more refined look that better suits the smaller case proportions.
Price and Positioning
At $6,725 USD, the Black Bay Chrono 39 positions itself as one of the most compelling Swiss-made chronographs available. For comparison, the 41mm model is priced similarly, while the Rolex Daytona — which uses a more refined (and more expensive) movement — commands roughly three times the price at retail.
The combination of a proven chronograph movement, compact case proportions, and competitive pricing makes the Black Bay Chrono 39 a strong contender for anyone seeking a versatile, everyday chronograph without the Rolex premium.
Frequently Asked Questions
How does the Black Bay Chrono 39 compare to the 41mm version?
The 39mm model is 2mm narrower and 1.3mm thinner than the 41mm version. It uses the same MT5813 movement but achieves a more compact profile through refined case architecture.
Is the Black Bay Chrono 39 COSC certified?
Yes. The MT5813 movement carries COSC Chronometer certification, with Tudor's in-house testing further refining accuracy to -2/+4 seconds per day.
Will Tudor release more dial colors for the Chrono 39?
Tudor has indicated that additional dial options will follow. The "Bumblebee" black-and-yellow is the launch variant, with more colors expected in the coming months.
Sources: aBlogtoWatch (June 19, 2026), Tudor Official Website
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