Tudor Caliber MT5402 Watch Movement

Brand	Tudor
Caliber Number	MT5402, MT-5402
In-House?	No
Manufacturer	Kenissi
Chronometer Rated?	Yes
COSC Certified?	Yes
Diameter	26mm
Thickness	6.5mm
Jewel Count	27
Vibrations Per Hour	28,800 bph (4 Hz)
Lift Angle	49 degrees
Accuracy Rating	-2 to +4 sec/day
Power Reserve	70 hours
Balance Spring	Silicon, non-magnetic
Oscillator	Variable inertia balance, micro-adjustment
Hands Count	3
Functions	Central hours; central minutes; central sweeping seconds
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Tudor Black Bay Fifty-Eight (Ref: M7903N-001, M7903N-002, M7903N-003, M7903B-001, M7903B-002, M7903B-003), Tudor Heritage Ranger (Ref: M79950-0001, M79950-0002, M79950-0003) (Add your watch in the comments below…)

The Tudor caliber MT5402 is a true no-date (ND), 3-hander automatic movement with 27 jewels and a beat rate of 28,800 vph (4Hz). This manufacture movement is a chronometer (certified by COSC), equipped with a bidirectional rotor system and variable inertia balance, micro-adjustment by screw. This caliber also features a non-magnetic silicon balance spring.

Some of the topics covered in this caliber listing:

MT5402 VS MT5400:

There is a similar Tudor caliber MT5400 with the main difference being that the MT5402 discussed on this page is a smaller version of the MT5400 (26mm vs 30.3mm). The reason for the larger diameter of the MT5400 is purely cosmetic, due to the fact that watches powered by this caliber (such as the 925 and gold Black Bays) feature an exhibition style caseback.

In Tudor’s own words:

“The Ranger model is equipped with Manufacture Calibre MT5402. Its construction has been designed to ensure robustness, longevity, reliability and precision due to its variable-inertia balance, which is held in place by a sturdy traversing bridge with two points of fixation.”

More from the Tudor Ranger marketing materials:

“Manufacture Movement”

The MT5402 is another movement that some label as an in-house movement, but Tudor themselves refer to as a manufacture movement. Even more confusion comes about due to the fact that calibers such as the MT5402 are manufactured by Kenissi (not exactly Tudor), but Kenissi is owned in part by Tudor (Chanel being the other part). This just means that the movement wasn’t 100% designed and produced entirely by Tudor itself, but and outside supplier – that happens to be owned by Tudor.