Caliber Corner stickers are here!
Tudor Caliber Mt5621 Movement

Tudor Caliber MT5621

Tudor Caliber Mt5621 Movement

ManufacturerTudor
Caliber NumberMT5621, MT-5621
In-House?Yes
Diameter33.8mm
Height
6.5mm
Vibrations Per Hour28,800 bph (4 Hz)
Power Reserve70 hours
Jewels28
Hacking?Yes
Hand-Windable?
Yes
COSC?
Yes
FunctionsHours, minutes, central seconds, date at 3:00, power reserve indicator at 9:00
Country of ManufactureSwitzerland
Known Models
Tudor North Flag – Ref: M91210N-0001 (steel bracelet), M91210N-0002 (black leather strap)

The Tudor MT5621 automatic caliber is an in-house Certified Chronometer (COSC) movement. It is equipped with a bidirectional rotor system and variable inertia balance, micro-adjustment by screw. This caliber also features a non-magnetic silicon balance spring – a first for Tudor (aka Rolex).

Tudor Caliber MT5261

In Tudor’s own words:

“This movement provides impressive autonomy. Its power reserve of approximately 70 hours means that its wearer can, for example, take off the watch on Friday evening and put it on again on Monday morning without having to wind it. Beating to a frequency of 28,800 beats/hour or 4Hz, the movement is regulated by a variable inertia oscillator with silicon balance spring, held in place by a traversing bridge fixed at both sides to improve resistance to shocks and vibrations. Its self-winding system is bidirectional. The movement is certified by the Swiss Official Chronometer Testing Institute (COSC).” –Tudor

What do you think about Tudor Caliber MT5621? Keep comments respectful and follow our community guidelines.
Subscribe
Notify of
guest
7 Comments
Inline Feedbacks
View all comments
Tom
Tom
5 years ago

And this is after Rolex has been saying no silicone hairspirings and no see-through case backs for years! Liars!

King Henry VIII
King Henry VIII
5 years ago
Reply to  Tom

That may very well be true for Rolex as a brand, but this is a Tudor movement 😛

Nancy G.
Nancy G.
5 years ago

Is it made by Rolex? I’m confused.

TheOneInYellow
TheOneInYellow
2 years ago
Reply to  Nancy G.

The Manufacture Calibre MT5621 is the very first in-house movement made by Montrés Tudor in their own facilities (with possible engineer help from Montrés Rolex). Introduced at Baselworld 2015, this news blew the watch industry journalist’s minds, because this was totally new, yet not unexpected. The North Flag also has many firsts for Tudor: – First use of ceramic in a ceramic/steel construction (ceramic ring is the bezel, topped with a stainless steel ring, and… Read more »

Randy Axy
Randy Axy
2 years ago

This makes it look like Tudor is Rolex’s experimental division. My last 2 watches have been Tudor, one being a North Flag watch with this exact movement. I don’ think I will ever buy another Rolex. The Tudors are way cooler for less than half the price.

RY
RY
1 month ago

I think you have the number wrong there.

7
0
Would love your thoughts, please comment.x
()
x