Movement Review,  Patek Philippe

The new Patek Philippe 26-330 caliber – The latest evolution from the Automatic 324 caliber

Hello everyone,

It wasn’t loudly announced during the 2019 Baselworld fair but the new Patek Philippe 26-330 caliber has been released. It was introduced inside a 2019 novelty (5212A Weekly Calendar) as well as an update to existing references (the 3 remaining 5711 Nautilus in the catalogue). Moreover, some of its new features have been added to the new 5520P Alarm’s movement.

We can of course expect that the 26-330 will be extended to the other references in the future as a successor to the 324 caliber.

Patek Philippe 26-330 caliber_5212_HighTime
The new Patek Philippe 26-330 caliber (5212A version)

As usual with Patek Philippe, and despite what its very traditional image might suggests at first, the manufacture’s watchmakers continuously improve their calibers. They follow their own R&D process. Neither too fast, nor too slow and doing as such with usually clever moves, dealing astutely with tradition and technical evolutions.

This caliber base isn’t new but has certainly significantly evolved in terms of timekeeping and reliability since:

  • the 335 and 310 (4 Hz, since 1982);
  • followed by the 315 and 330 (3 Hz, since 1991);
  • until the current famous 324 (4 Hz, since 2004).

As they are used to, Patek watchmakers find smart improvements, yet as simple as possible, and only if it enhances accuracy, reliability or setting ease.

What’s new

As a reminder, the new caliber keeps similar stats to the 324 generation it is coming from: for the base versions, it means 26.6mm in diameter, 3.3mm thick (hence the “26-330” reference), min.35 – max.45 h, 28,800 vph (4 Hz), Spiromax (Silicon-based Silinvar spiral) and unidirectional winding.

You can recognize whether it’s a 324 or a 26-330 from the winding rotor’s shape. By the way, you can first notice on the 26-330 picture that the rotor central axle locking mechanism has changed (more secure compared to the previous screw).

However, these similar characteristics hide the fact there are 3 main areas in which the brand has implemented new distinctive features:

  • the “No-play” wheel (1 element);
  • the Winding mechanisms (3 elements);
  • the Stop-second feature (1 element).

It might look a little technical but once understood, it helps appreciating more what PP is all about and the invisible, beautiful and small technical features our watches contain.

– 1st area: No-play wheel

From the “324” picture and the “324” plastic model picture further below: until now, in order to prevent the central seconds-hand from vibrating (at each “tic”) due to the usual gap between 2 wheels (Fig.1), its standard wheel (in the light purple square, Fig.3) was “controlled” by a classic friction spring applied on a pinion (Fig.2 and the lower part is visible on Fig.3).

Patek Philippe 324 Second wheel_HighTime
(Fig.1) 324 caliber second hand with second wheel (showing a small gap in between)
Patek Philippe 324_Friction spring_HighTime
(Fig.2) In purple, the 324 anti-backlash part (applied on the wheel), friction-based
Patek Philippe 324_SC_FUS calibre_HighTime
(Fig.3) The 324 caliber: second wheel (in light purple), winding clutch wheel (in blue) and back-lash screwed part in-between

However, because friction should be avoided (wear, metallic residue spread, energy waste) and to ease the setting phase, Patek has developed a very technical and quite beautiful wheel (see the light purple square in the “26-330” picture below) in order to replace several of the elements implied.

Patek Philippe 26-330 caliber_5212A_HighTime
The 26-330 caliber: new second wheel (in light purple), new declutching display (in blue), new rotor central cap

To make it simple, as illustrated in the “26-330” plastic model picture below, each tooth is split in 2. It creates this small blade that remains applied against the opposite wheel’s teeth. The gap is thus always filled thanks to the bending blade.

Patek Philippe 26-330 Second wheel_HighTime
26-330 second wheel and second hand matching without gap
Patek Philippe 26-330 Second wheel_HighTime
How the spring moves when the second tooth applies on it

Because of its size, it is made via the LIGA process; material growth from a Nickel and Phosphorus alloy. Later on, it is gold-copper-iridium coated.

I didn’t bring my ruler at the presentation but the wheel diameter should be around 3mm and the small blades (shown on the “plastic model” picture) are 0.022mm “thick” in the (micro) metal. I have a good vision from close range but it is unbelievable how thin these blades are.

Patek Philippe 26-330 caliber Second wheel_HighTime
The new seconds wheel next to a Patek Philippe catalogue

When I asked why the power reserve didn’t increase in the process, I was explained that Patek’s watchmakers decided to keep the saved energy for improving the time accuracy.

Indeed, the potential power reserve increase wouldn’t have reached such a level it would have amounted to a full day. Indeed, gaining 5 or 10 hours wouldn’t have helped anyway to last from Friday evening to Monday morning (max. 45h base). Furthermore, even with a 60-hours power reserve movement, it is usually better to wind it daily because of the lower timekeeping capabilities in the last third of a reserve.

For those who like figures, and thanks to the energy gain, the balance wheel has been modified. Hence, its inertia has progressed from 4.7 to 5.5 (like in the 215 caliber). Meanwhile, the friction decrease brings around 40° of balance amplitude.

We sometimes wonder about whether brands should be using modern tools and applying modern techniques for traditional watchmaking. There might be limits but this example is the kind of improvements that wouldn’t have been possible before because of its dimensions. Aside from looking nice.

Last but not least, jewels were added to the seconds-hand pivots.

From Mr Barat (Head of Watch Development at Patek Philippe), this is the main evolution inside the 26-330 caliber.

– 2nd area: 3 innovations related to the winding mechanism

Inside this section, let’s have a look at 3 additional improvements applied to the winding system (see picture below):

– A declutching module (called below “Uncoupling reduction wheel”) for the manual winding use (a.);

– A new “Stop click” spring (called “Winding wheel – Stop click”) for the armament display (b.);

– Another declutching module (called “Uncoupling wheel”) for the winding rotor (c.).

Patek Philippe 26-330_Self winding improvements_HighTime
The 3 innovations brought to the 26-330 caliber winding mechanism

    a. new Manual-winding Declutching module (“Uncoupling reduction wheel”)

In practice, we often wind manually our automatic watches (e.g. when it was stopped (unused for a while) or to prevent it from running out of energy before the next time, like during week-ends).

The downside of the previous system used in watchmaking (sliding flange) is that it produces wear and residues on the long run.

In the 26-330, Patek used a similar approach to the declutching module used for the rotor (3rd one from the top in the picture above and discribed in detail in c.). They have replaced the existing sliding flange (friction-based) by an Uncoupling Reduction wheel (see 1st one from picture above) that disengages the rotor from the barel (where the energy-supplier spring is) when the crown is pulled.

Simple, yet needing important design changes to remain reliable.

    b. “Stop click” spring feature (“Winding wheel – Stop click”)

Patek has also modified the little “Stop-click” part preventing the barel from unwinding when it’s “charged”. In the 26-330, a new long helical spring was added to control the click action when back in blocking position (see the 2nd “Winding wheel” in the picture above). Previously, it needed some settings to perform the correct way (more reliable now).

    c. Central rotor Declutching module (“Uncoupling wheel”)

We know the winding rotor with sliding flange is quite classical a feature even if it can differ from a brand to the other. However, here again, Patek has modified a mechanism that could be ignored as it’s already working well.

So, why spending time for this matter? Just because it can still be improved, even if we’re talking about an element which might look secondary.

The modification stands at the level of the plain wheel that you can see on the 324 caliber picture (fig.3) posted earlier at the beginning of the chapter (blue square). This element connects the gold rotor to the winding mechanism when rotating in one direction and disengages when moving the other way. The disengaging feature is here composed of several parts (blade, stopper etc…). As usual, the more parts, the more you have to go through a long setting process and may be facing reliability issues.

In the new 26-330 caliber, Patek has integrated all the parts in a single module doing all the work (see the 26-330 picture below, blue square). The new wheel is hollowed out and receives an octopus-shaped flexible star that simply bends and slides in one way (disengaged position) or clings to the main wheel when going the other way (engaged position for winding).

Patek Philippe 26-330 caliber_5212A_HighTime
26-330 caliber: the new rotor declutching display (blue square)

Again, this is quite easy a solution to understand, yet clever. This being said, it is still “a little” tricky to design and complex to craft at these dimensions. Compared to the former mechanism, it is more compact, more reliable and doesn’t need blade setting (strength, position).

– 3rd area: Stop-second mechanism

Finally, the third noteworthy addition to the movement, a feature that many owners like to have in their watches and that was only available in a very few other Patek calibers: the Stop-second mechanism.

Patek Philippe 26-330_Stop Second_HighTime
The new Stop-second mechanism integrated in the 26-330 caliber (and in most new calibers from now on)

It uses a traditional blade that stops the balance wheel when the crown is pulled and that gives a little impulse when the crown is pushed back to help reactivating the escapement module. Not a revolution but quite welcome as owners were asking for it.

Patek Philippe 26-330_Stop Second_detail_HighTime
The 26-330 caliber Stop-second display

And finally, a view on the 5212A‘s 26-330 caliber where you can view these improvements (the stop-second isn’t visible from that side).

Patek Philippe 26-330 5212A caliber_HighTime
The 26-330 caliber inside the 5212A

Conclusion and Thoughts

As mentioned in introduction, from 2019, the 26-330 caliber can be found in 4 models while the new rotor declutching module and no-play wheel display have been implemented in the 5520P through its new 30-660 Alarm caliber.

As I often like from Patek (29-535 chronograph caliber, 5650G Advance Research pushers etc…), many innovations are clever, useful, not gimmicky and as simple as possible. This latter element isn’t always associated with the first ones when brands start to show-off. Especially in this luxury sector.

Here, the improvements are mainly made to improve energy management, accuracy and reliability on many levels. Furthermore, it saves setting time and effort but also provides a nicer and fluid seconds-hand motion. It can only be more enjoyable for the wearer.

It is all about details and there are now new interesting things to observe on these calibers for sure.

There’s a very interesting video from Patek about the 5212 Weekly Calendar reference, dealing (from the 3:10 mark) with the 26-330 caliber. I really recommand viewing it:

Patek’s YouTube channel video

You can of course find some additional information on Patek’s website, here:

Patek’s website movements’ page

Thanks for reading!


  • Brad

    Thanks for the clear and thorough explanation of these updates. Thanks as well for the link to the 5212 video that further explains the changes. Well done!

    • Mark

      Hi Brad,
      Thanks a lot for the kind words! There are indeed many very discreet little things to enjoy in watchmaking and especially how Patek considers its improvements’ strategy.

  • Alex Trip

    I know I’m crazy for posting this – but I’m looking to buy that exact seconds wheel.
    I run a small independent watch repair company here in the heart of downtown Miami, Florida. I have one of these watches sitting on my desk who another watchmaking company had a crack at.
    In their failed attempts they decided they would work in the seconds wheel in question (the one pictured next to a catalogue)
    I have since figured out how to put the wheel in the correct sequence, but due to the damage on it, it simply won’t work.
    When I saw this article and the wheel in a package just sitting next to a catalogue, I just had to try and buy it or see if someone can sell it to me though this comment. Excuse my arrogance. I just want to get the watch back to the customer. He would gladly go to Patek if it wouldn’t take so long.
    I’ve fixed many a Patek in my lifetime, vintage and modern. So I promise I’m worthy and am willing to show it. Thanks.

    • Mark

      Hi Alex,
      In fact the little seconds wheel (patented and produced through a very specific process) was shown during a press event. I’m pretty sure that you’ll never be able to purchase one as I believe Patek would consider they are the only one authorized to produce it and service it. I would suspect it has to go through the official network.

    • Mark

      Hi Jeff,
      I believe it might be hard to get a precise answer except by asking an official AD or Salon (maybe you should try Geneva). Otherwise it might require to find new owners telling when they got theirs and trying to guesstimate the date.
      It’s a very nice model to consider.
      Good luck in your search!

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