Tudor Big Block Ecole d'Horlogie de Genève “School watch” Silver Dial Ref 94300This is an exceptional Tudor Big Block that we believe was a special order piece for the prestigious Ecole d'Horlogie de Genve, as indicated by the full serial number engraved inside the case back . Also often seen for special watches from mother brand Rolex , like Mill subs , Khanjar dials and others ! These watches were used as watch makers to be as final exam project ! This watch not only represents a significant piece of Tudor's history as the