Serial numbers in luxury designer bags can often be an important factor when authenticating an expensive item you bought online, found at the thrift store or bought from anywhere other than the official brand store. Have you ever wondered what those numbers inside your Coach bag are? Or if they actually mean something? And if they can help you authenticate a bag you bought second hand? If the answer to any of these questions is “yes”, or you would just love to brush up on your Coach serial numbers, keep reading!