Coach's security password is usually a string of numbers, located near the zipper in the bag. This code consists of letters and numbers, and the last four digits are the style code. On Coach's official website, the security code is used to verify the authenticity of the package. However, some small coach bags, such as handbags, messenger bags and mini bags, may not have this code. At the same time, some old bags, especially those before the end of 1960s, may not have this security code. To verify the authenticity of the package, besides checking the security code, you can also check other features, such as CC pattern, zipper head and "YKK" trademark.