Introducing the Tudor Black Bay Chrono 39 "Bumblebee"

The Tudor Black Bay Chronograph has entered a bold new chapter. With a brand-new 39mm case, a column-wheel Manufacture Chronograph calibre and a striking yellow-and-black dial, the Black Bay Chrono 39 “Bumblebee” makes a confident statement. Joining its “Pink” and “Flamingo Blue” stablemates in the Tudor Daring Watches collection, it combines motorsport heritage with diving-watch DNA in one expressive sports chronograph.

Why the Black Bay Chrono 39 “Bumblebee” Stands Out

The most immediate talking point is the bright yellow domed dial, contrasted by two hollowed circular black sub-counters for clear, legible timekeeping. But the appeal runs deeper than colour. The redesigned 39mm case measures a slim 13.1mm in thickness and 47mm lug to lug, giving it balanced proportions that suit a wide range of wrist sizes.

Inside beats the column-wheel Manufacture Calibre MT5813, certified by the Official Swiss Chronometer Testing Institute (COSC), delivering a generous 70-hour power reserve alongside smooth, reliable operation. The signature “Snowflake” hands have been honed specifically for sub-dial legibility, the pushers carry a new knurling pattern, and a new three-link bracelet with smooth link sides completes the package.

A Heritage of Asphalt and Sea

Tudor’s chronograph story began in 1970 with the Oysterdate, the brand’s first chronograph, which was quickly embraced by the world of motorsport. Since 1954, Tudor has equally devoted itself to refining professional divers’ watches. The Black Bay Chrono brings these two traditions together in a single timepiece, pairing contrasting sub-counters with a high-performance automatic Manufacture calibre featuring column-wheel construction and a vertical clutch.

Faithful to the Black Bay aesthetic, the model retains the famous “Snowflake” hands first seen in Tudor’s 1969 catalogue, here refined for optimum readability. The dial layout draws on the first generation of Tudor chronographs, with a 45-minute counter and a date aperture at 6 o’clock. Satin-brushed and polished finishes, bevelled lugs and the Tudor shield-signed crown are all present, while the stainless steel pushers take their cue from the second generation of Tudor chronographs. A fixed stainless steel bezel with a black anodised aluminium tachymetric insert rounds out the sporty character.

Steel Bracelet with “T-fit” Clasp

The Black Bay Chrono 39 is fitted on a new three-link stainless steel bracelet with smooth link sides and the Tudor “T-fit” rapid adjustment clasp. Tool-free and easy to use, the system offers five positions for fine, instant adjustment of the bracelet length within an 8mm window. Ceramic ball bearings ensure a smooth, secure closure and a satisfying tactile action.

The Manufacture Chronograph Calibre MT5813

The Calibre MT5813 displays hours, minutes, seconds, chronograph and date functions, finished in the manner typical of Tudor Manufacture calibres. Its openwork tungsten monobloc rotor is satin-brushed with sand-blasted details, while the bridges and mainplate alternate sand-blasted and polished surfaces with laser decorations.

Beyond COSC certification, Tudor applies its own stricter standard: where COSC permits an average daily rate variation of -4/+6 seconds for an uncased movement, Tudor holds the fully assembled watch to -2/+4 seconds per day. The movement is derived from the Breitling Manufacture Chronograph Calibre B01, fitted with a high-precision regulating organ developed by Tudor and exclusive finishes, the result of a lasting collaboration between the two brands. A silicon balance spring adds anti-magnetic resilience to the package.

Five Decades of Tudor Chronographs

The “Bumblebee” continues a lineage that began in 1970 with the Oysterdate, a robust and functional chronograph known for its bright colours, pentagonal “home plate” hour markers, 45-minute counter and date at 6 o’clock. That watch paved the way for more than 50 years of technical chronographs, including a memorable bright yellow “Tiger” in the 1990s, of which the Black Bay Chrono 39 “Bumblebee” is a worthy spiritual successor.

Technical Specifications – Reference 79310N

Case: 39mm diameter, 13.1mm thickness, 47mm lug to lug; stainless steel with polished and satin finishes; waterproof to 200m (660 ft).

Bezel: Fixed stainless steel bezel with black anodised aluminium insert and tachymetric scale in silver.

Dial: Domed yellow dial with black sub-counters; date at 6 o’clock; domed sapphire crystal.

Crown & Pushers: Stainless steel screw-down crown with Tudor shield in relief; screw-down pushers at 2 and 4 o’clock.

Movement: Manufacture Calibre MT5813, self-winding mechanical chronograph with bidirectional rotor; 4 Hz (28,800 beats/hour); 41 jewels; non-magnetic silicon balance spring; COSC-certified; approximately 70-hour power reserve. Movement diameter 30.4mm, thickness 7.23mm.

Functions: Central hours, minutes and chronograph seconds; 45-minute chronograph counter at 3 o’clock; small seconds at 9 o’clock; instantaneous date at 6 o’clock; stop-seconds for precise setting.

Bracelet: Three-link stainless steel bracelet with polished and satin-brushed finishes and Tudor “T-fit” rapid adjustment clasp.

Guarantee: Five-year transferable Tudor guarantee, with no registration or mandatory maintenance checks required.

Discover the Black Bay Chrono 39 “Bumblebee” at Watches of Switzerland

As an official Tudor retailer in Australia, Watches of Switzerland is proud to showcase the Black Bay Chrono 39 “Bumblebee” (Ref. 79310N). To register your interest, learn more about availability, or arrange a viewing, contact our team or visit a Watches of Switzerland boutique.

Frequently Asked Questions:

What is the Tudor Black Bay Chrono 39 “Bumblebee”?
The Tudor Black Bay Chrono 39 “Bumblebee” (Ref. 79310N) is a Swiss-made sports chronograph featuring a bright yellow domed dial with contrasting black sub-counters. It houses the COSC-certified column-wheel Manufacture Calibre MT5813 in a 39mm stainless steel case and forms part of the Tudor Daring Watches collection.

What is the reference number of the Tudor Black Bay Chrono 39 “Bumblebee”?
The reference number is 79310N.

How big is the Tudor Black Bay Chrono 39 “Bumblebee”?
The case measures 39mm in diameter, 13.1mm in thickness and 47mm from lug to lug, giving it balanced proportions that suit a wide range of wrist sizes.

What movement powers the Black Bay Chrono 39 “Bumblebee”?
It is powered by the Tudor Manufacture Calibre MT5813, a self-winding mechanical chronograph with a column-wheel mechanism and vertical clutch. It is COSC-certified, runs at 28,800 beats/hour (4 Hz), has 41 jewels and a non-magnetic silicon balance spring. The movement is derived from the Breitling Calibre B01, fitted with a high-precision regulating organ developed by Tudor.

What is the power reserve of the Black Bay Chrono 39 “Bumblebee”?
The Calibre MT5813 offers a power reserve of approximately 70 hours.

Is the Tudor Black Bay Chrono 39 “Bumblebee” water resistant?
Yes. It is waterproof to 200 metres (660 feet) and is protected by a domed sapphire crystal and a stainless steel screw-down winding crown.

Why is it called the “Bumblebee”?
The nickname refers to the watch’s striking yellow-and-black colour scheme. It also nods to Tudor’s chronograph heritage, including a bright yellow “Tiger” chronograph from the 1990s.

What functions does the Black Bay Chrono 39 “Bumblebee” have?
It displays central hours, minutes and chronograph seconds, a 45-minute chronograph counter at 3 o’clock, small seconds at 9 o’clock, and an instantaneous date at 6 o’clock. It also features a stop-seconds function for precise time setting.

Does the Black Bay Chrono 39 “Bumblebee” come on a bracelet?
Yes. It comes fitted on a three-link stainless steel bracelet with polished and satin-brushed finishes and the Tudor “T-fit” rapid adjustment clasp, which offers five tool-free positions across an 8mm adjustment window.

What guarantee does the Tudor Black Bay Chrono 39 “Bumblebee” come with?
It is covered by Tudor’s five-year transferable guarantee, which requires no registration and no mandatory maintenance checks.

Where can I see the Tudor Black Bay Chrono 39 “Bumblebee” in Australia?
Watches of Switzerland is an official Tudor retailer in Australia. You can register your interest, enquire about availability, or arrange a viewing by contacting our team or visiting a Watches of Switzerland boutique.