Look at your Doxie’s serial number to find the model number: The original Doxie Go: Serial number starts with DX200 or DX210 Doxie Go Plus. Advantages Disadvantages Concurrent Development Model Software Engineering. Crown/pushers: Steel fluted crown Crystal: Acrylic Movement type: Manual-winding with sweep seconds hand. Case serial number: n/a Case back: Snap-on, signed ‘Fond Acier Inoxydable Doxa SA Swiss' on the inner side of the caseback, bearing serial number on the outer side of the caseback.