If you are in doubt about the authenticity of the watch, you can mail the watch, the international warranty and the bill for buying the watch to Beijing Maintenance Service Center for authenticity identification. The period is about 10 day. If it is a fake watch, there is no charge, only you need to bear the round-trip freight. If it is identified as a genuine watch, subsequent testing will be carried out and fees will be charged according to the testing content. The specific charge will also depend on the model of the watch, which is a unified charging standard.