COUNT DE MONET
10797
Seven years is a maximum interval for a service
... as the oil is vaporising.
That is the real reason for a service, not that the movement is still running.
You can go even down to 3,5 years for very important watches.
The calibre question: the cal 240 can be wound with a crown with a mere 3 mm (if that much) in diameter.
This is an impressive fact for it self and shows how smooth things run but on top of it the mentioned crown (in an Ellipse) has also a winding stem that
is made out of two parts.
I think this should give you an idea of the winding efficiency and hence reliability of the cal 240.
I had to have it and as it came in an Ellipse I had to surrender myself 
!
Best
Moritz
reliability of 324 and 240 movement
Hi guys, I hear often that 324 is a very reliable movement. I am just curious, has anyone here owned a Patek with 324 movement for more than 5 years without any service? How about caliber 240? Anyone had 240 movement watch fro more than 5 years without se...
My experience
tells that Cal. 240 is more reliable than 315/324. Patek 5110P with Cal. 240 no service since 2005 - 8 years already! Patek 5712 1/A with Cal 240 no service since 2009 - 4 years. Patek 5167 A with Cal 324, already serviced after 1.5 years. Reason: low rot...
My 5120
was without service for over 5 years and no problems. Another 3940 without service for 10 years and it was still bloody accurate. Best, Kari
Seven years is a maximum interval for a service
... as the oil is vaporising. That is the real reason for a service, not that the movement is still running. You can go even down to 3,5 years for very important watches. The calibre question: the cal 240 can be wound with a crown with a mere 3 mm (if tha...
Wish to clarify...
I wish to clarify this issue about servicing. Reading many of your post, it gives me a sensing that a watch Patek has to be serviced after x number of years. Does it have to be serviced even if it is keeping good time, after x number if years ? Or Does it...
You have to service ...
... that is also a part of being a watch enthusiast. Even if you never wear it, always keep it in a box still it needs servicing before you use it. I personally would stretch the interval to seven years. Some here do even three and a half years. Regardles...