TF factory IWC Portuguese tourbillon reverse series 9-bit position equipped with 1:1 reissue version of IWC Autonomous Cal. 51900 Fully automatic true tourbillon

TF factory IWC Portuguese tour wheel reverse return series . 9 word bit equipped with 1:1 re-engraved version of the world's independent Cal. The 51900 fully automatic true tour wheel movement achieves the true functionality of the original consistent 6-bit display