Haydn sent in this Patek Philippe for a service. The power reserve is very low, and it doesn’t run reliably, and I can’t pick up a signal on the timegrapher.
The calibre 350i is a pretty special construction, and the winding/stetting wheel on the back of the watch gives us a hint to that.
The dial has screws as dial feet, which are held with nuts in the movement – very nifty.
Just what you expect from a PP – very nice finishes throughout.
The winding stem is at 4 o’clock of the large blued screw, and left of it the Geneva Seal. Note that the barrel arbor isn’t jewelled. Now you can see why the winding/stetting wheel is at the back. The rotor doesn’t move on top of the movement, but around it, so a traditional winding stem couldn’t be fitted. This construction makes the movement nice and thin, even though it’s automatic.
The auto winder gears. the brass coloured wheel at the bottom is the one that engages with the rotor. The rotor only winds in one direction, as you can see from the ratchet wheel and its click. Apparently, the original calibre 350 had bi-directional winding, which caused a fair amount of problems, so the 350i (improved) has only uni-directional winding.
Here you can see the winding construction – the winding stem is held by a clamp with a blued screw. On the right side of the click wheel, the automatic winding mechanism sits.
Now the gear train is visible.
Now it’s time for the bottom plate.
The rotor, which is suspended from the inner rotor ring with ball bearing, which isn’t oiled.
All parts cleaned and ready for re-assembly.
Mainsprings aren’t available, but the old one is still in very good condition.
The escape wheel has cap jewels that can’t be removed, so they have to be oiled through the jewel hole.
The gear train is back in place.
The wheel bridge is mounted, and I can put the winding mechanism into place.
Now the auto winder gears go in.
And we have a beating movement.
Now I put together the bottom plate.
And the movement is ready for casing.
Back into service.And looking very good on the timegrapher, too!
I know, that I am rather late to leave a comment, but as I just purchased a 1-350 in a beautiful white-gold case with integrated milanaise-strap, which is running very nicely and reliably, I can only say there is no trouble whatsoever… You don’t feel the crown as it is fits in very smoothly. Allover a very unusual piece! But I have a question: I have the feeling, that Patek worked on the 350 and transformed it to 1-350, as the engraving of the “350” seems to be removed and replaced by “1-350″… Does anybody agree? Or is there another explanation for the deepening, in which the “1-350” sits? And did the rotorsegment appear later in 18k gold, as I have seen pictures with a metal-segment…
Best regards!
this caliber was designed by JLC for Audemars,Vacheron and PP, The slimmest automatic watch in the world ‘almost’ ( Piaget designed one with a micro rotor .001 mm thinner) but it was too fragile to be of much practical use, the 60s model I own has ruby rollers that sermount a beryllium ring for the auto winding movement, Jaeger Le Coultre did not use this caliber on any of there watches,
Can i ask how you dealt with the mainspring? Did you remove and lubricate the wall? I may have one coming in for repair and i’m curious if you have any other tips.
Hi Steve,
Yes, I put braking grease on the barrel wall before putting in the mainspring. The job was pretty straightforward.
hi,
I need the gold screw that hold the gold winding crown for a patek 350.
Please let me know if anyone has one available.
thank you,
jeff
i need the gold screw that holds the gold winding crown for a patek 350 back set.
please let me know if anyone has one available.
thank you,
jeff
Sorry, but I can’t help you there. Maybe one of our readers can help?
Hi,
I am in the processing of buying a 3563… I-350 caliber. It seems to beat well, but I am buying unseen, so a bit nervous. As an specialist, do you think I am buying a heap of trouble? I really love this watch concept, but I am a bit afraid that it will turn out unreliable.
Thanks,
Lluís
I really wouldn’t buy the watch unseen. Spare parts are very expensive, and very hard to get.
What a watch!! The rotor made my day.
Hey christian can I post one of your pics (of the HMT sona movement) on facebook? BTW nice work done on a nice watch.
No problem, but please mention where you got it from.
Best regards,
Christian
Thanks. Will post the links to your website.
Hi Christian,
beat error on this watch is right on the money. Did you have to adjust it?
Yes, that was adjusted.
I like that very much – especially design of the rotor!
What does the notch in the dial relate to?
There is a pin in the case back and a hole in the case that align the dial through that notch.
Very nice movement!
If the escape wheel endstone can’t be removed, how will it clean properly? Won’t it retain cleaning fluids or congealed oil? (I’ve never worked on a watch of this quality)
You just have to run it through the cleaning machine again if it isn’t completely clean… the rinse will dry off in the drying cycle, so it’s pretty much ok. You can find this construction in the Bulova Accutron watches as well.
Not my favourite – I prefer being able to take the cap jewel out.
Maybe pressing the jewel brass ring with a seitz jewelling tool will help to extract the assembly and allow a proper cleaning?
I find hard to believe that this part should be cleaned and oiled that in that so poor way.
I will not try that. There are no parts available.
Thanks Christian for an excellent service. I have not received the watch yet whilst I am on holidays but your work is always excellent with great attention to detail. Is this the 3rd or 5th your have serviced for me! 😉
I love the look of these watches without a crown. I have read so much opinionated rubbish on the web about this movement. Despite needing a service I found the watch to keep pretty good time after being worn for a while. But it does need to be worn and not left lying around. I also found it very comfortable and the back crown is not an issue at all. I don’t notice any disadvantages to be honest.
After the service, the watch now has a decent power reserve, so it’s not a problem if you leave it lying around for a day, and then pick it up again.
That’s certainly a unique auto-winder! Kind of wondering how that crown feels against the wrist. Did you take it for a ‘test drive’ around the shop? Owner’s permission and all that, wink wink!
Let’s wait for the owner to let us know how it feels…
Question answered! I truly learn something new every time I visit your blog. It has to be good, challenging fun to work on unique pieces such as this. Keep up the great work!
I wondered about how that crown – is it still a crown? – feels against the wrist… looks like it might be somewhat annoying!
No not annoying at all. No worse than being left with a longines ship or something imprinted in your wrist!
I have a Tag Carrera that has such a sharp crown, it built a callus on my wrist!