Patek Phillipe watches are coveted items and have been seen on the wrists of royalty like Princess Diana to celebrities such as Brad Pitt. If you are looking to buy a Patek Phillipe watch second hand you’ll want to know how to check if a Patek Phillipe is real or not. Our top tips for checking authenticity are below, though the only way to know for sure is to have its authenticity verified by a professional.