Patek Philippe has been very successful selling the Watch to the rich and famous celebrities, Politicians, business men with a Sales slogan:
“You never actually own a Patek Philippe; you merely look after it for the next generation”
As a good mechanical watch can last a few centuries with good services and maintenance.
Patek Philippe is still maintaining the watch record back to 1896 years, they are still maintaining spare part back to watch of early1900. Even the part is used up, the make it.
So when you buy a Patek Philippe, it is a real Investment. It will last forever, value is always there! Of course, it is not cheap to maintain a watch like this!