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 Portugal tourbillon reverse series 9-character position equipped with 1:1 re-engraved version of IWC Autonomous Cal. The 51900 automatic true tourbillon movement achieves the true function of the original 6-digit display