Prada makes high-quality and expensive merchandise. In order to spot these sunglasses, the manufacture list serial numbers and model numbers on each pie of Prada sunglasses, then you can verify the authenticity,p.s. in every Prada shops. There are several ways which can help you sopt them. The ways are as follows: First, locate the Prada authenticity cards have Prada's name engraved on them which cannot be printed, even second-hand Prada sunglasses have such cards; second, read your authenticity cards to determine if a model number was listed on back. Third, check the model number in an authorized retailer, like Saks or Neiman Marcus, then you can get exact information about your Parda sunglasses.