Tudor Caliber MT5813

Brand	Tudor
Caliber Number	MT5813
Base Caliber	Breitling B01
Movement Type	Automatic, self-winding mechanical, bi-compax chronograph
In-House?	No (manufacture)
Certified Chronometer?	Yes (COSC)
Diameter	30.4mm
Height	7.23mm thick
Jewels	41
Beat Rate / Frequency	28,800 bph / 4Hz
Power Reserve	~70 hours
Accuracy Rating	-2 ~ +4 seconds/day
Rotor	Tungsten monobloc
Balance Wheel	Variable inertia style with screw adjustments
Balance Spring	Silicon (non-magnetic)
Anti-Shock System	KIF (needs confirmed)
Chronograph System	Column Wheel, vertical clutch
Functions	Central hours; central minutes; central chronograph hand; small running seconds at 9:00; 45 minutes chronograph subdial at 3:00; date at 6:00
Hacking Seconds?	Yes
Quickset Date?	Yes
Finish	Openwork rotor design, satin brushed, sandblasted details, polished surfaces with laser engravings
Country of Manufacture	Switzerland, Swiss made
Known Models	Tudor Black Bay Chrono (Ref: M79360N-002) (Add your watch to the comments below…)

The Tudor caliber MT5813 is an automatic chronograph movement found in the Black Bay Chrono. This column wheel chronograph caliber features a bi-compax (3-9) layout with running seconds at 9:00 and a 45 minutes counter at 3:00.

Accuracy Rating:

This is what Tudor says about the average accuracy rating of the MT5813:

“Boasting a 70-hour power reserve and a silicon balance spring, the Manufacture MT5813 chronograph Calibre is certified by the Swiss Official Chronometer Testing Institute (COSC), with its performance exceeding the standards set by this independent institute. In fact, where COSC allows an average variation in the daily running of a watch of between -4 and +6 seconds in relation to absolute time in a single movement, TUDOR insists on -2 +4 seconds’ variation in its running when it is completely assembled.” -Tudor Black Bay Chrono catalog

Is it an in-house movement?

The Tudor MT5813 is not an in-house movement. It is a manufacture movement, meaning that it was made for Tudor, but not by Tudor.

Base Caliber:

Tudor MT5813 is based on the Breitling B01 framework. The main difference is the layout of the chronograph subdials and that the Tudor MT5813 has 41 jewels VS 47 jewels in the Breitling B01. This is likely due to the difference in chronograph complication (bi-compax VS tri-compax).

In Tudor’s own words:

“Derived from the chronograph manufacture calibre Breitling 01, with a high-precision regulating organ developed by TUDOR and exclusive finishes, this movement is the result of a lasting collaboration between the two brands, which have chosen to pool their expertise in the design and production of certain mechanical movements.” -Black Bay Chrono catalog

Column Wheel Chronograph:

The chronograph complication in the MT5813 is a column wheel style. With its vertical coupling system, the chronograph hand returns to reset position with a smooth and precise motion without undesirable jumpiness observed on other chronograph systems.

Additional Resources:

• Official Tudor instruction manual (pdf)