Tudor Caliber MT5261

Tudor Caliber MT5621

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Tudor Caliber MT5261

Manufacturer Tudor
Caliber Number MT5261, MT-5261
In-House Yes
Measurements 33.8mm x 6.5mm
Vibrations Per Hour 28,800 bph (4 Hz)
Power Reserve 70 hours
Jewels 28
Hacking Yes
Functions Hours, minutes, seconds, date (3:00), power reserve indicator (9:00)
Country of Manufacture Switzerland
Known Models
Tudor North Flag

The Tudor MT5261 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).

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Tom
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Tom

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

King Henry VIII
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King Henry VIII

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

Nancy G.
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Nancy G.

Is it made by Rolex? I’m confused.

TheOneInYellow
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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 sits on a monocoque 316L stainless steel case). – First use of a sapphire display caseback – First use of a silicone hairspring in a… Read more »

Randy Axy
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Randy Axy

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.

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