There is nowhere to look up serial numbers for Movado watches online, as of 2015. Serial numbers can be verified by contacting Movado's customer service department directly.
Movado keeps a detailed catalog of all its watches' serial numbers. Watch owners can speak with a Movado customer service representative and ask them to crosscheck the watch's serial number against the catalog to determine authenticity.
A second option is to fill out a Repair and Service Request Form, available on Movado's official website, and send the watch to Movado Group International where it can be examined for authenticity. This option is appropriate if the watch has been purchased via an unauthorized dealer. In this case, it is impossible to determine the watch's authenticity without a physical examination.