IWC Portuguese Tourbillon series. Equipped with a customized version of IWC’s own Cal. The 51900 fully automatic true tourbillon movement has a deck upgrade. The original diameter is 44.2mm and the thickness is 15.5m. Strap: Italian cowhide front and back double-sided sapphire mirror, achieving the true function of the original calendar flyback and 3-digit power reserve display. Really synchronize with genuine products
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