[PATEK PHILIPPE Watches] The entire shell is made of 316 steel Wear resistant double sapphire glass mirror Swiss craftsmanship Design and create the perfect product. 100% waterproof. Can be worn directly for swimming It is the first choice for successful men with a diameter of 41mm to prove the pursuit of perfection Eternal and everlasting Equipped with pure original high-quality motion Zero faults are clearly visible through the bottom 0 Repair is as original and original