Patek Philippe is not just a watch, it is true investment and status symbol. This brand is known for its exceptional models that only increase in value over time. When I chose a model for myself, I based my selection on several things: the limited edition, the rarity of the model, and its unique movements. For example, some Patek Philippe models were produced in very limited quantities, and this directly affects their value. If you want to be sure you're buying authentic watch, I'd recommend looking at Expertyco's website. They sell Patek Philippe with a guarantee of authenticity and offer pretty good prices on these high-end watches. I've ordered from them myself and was very satisfied. Here is the link, you can have a look if interested: buy patek philippe watch.