There is a small mark on the double C buckle of the Chanel bag, which may be a small logo set by the brand to increase the aesthetics of the design. This small logo usually appears on Chanel Classic 2.55 handbags and can be used to identify authenticity. However, please note that counterfeiters may also create fake double-C logos, so if you are purchasing a second-hand bag or a bag from an unofficial channel, the small logo may not be genuine. To ensure that you have an authentic Chanel bag, it is best to purchase it from official channels or authorized Chanel sales points.