Re: Doxa Serial Numbers Also, from what I understand, the watches are not issued in absolute order for standard production models, as casebacks are produced and serialized in 'batches', so someone that orders new can get a lower S/N than an earlier purchaser, but they will likely be close in number if from the same run. 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. Crown/pushers: Steel fluted crown Crystal: Acrylic Movement type: Manual-winding with sweep seconds hand. Jan 25, 2018 - Offered for sale is an original pre-synchron and pre-aubry example of the cool Doxa Sub 300T Professional. Desene animate in limba romana. Details: Dial: The orange dial is in.