YL IW504402 portugisiske tourbillon revers serie er utstyrt med IWC egenprodusert Cal. 51900 helautomatisk ekte tourbillon.

YL IWC IW504402. The current quality closest to the authentic tourbillon watch. Portuguese Tourbillon Reversal Series Equipped with a customized version of Cal. 51900 fully automatic true tourbillon movement, original size: diameter 44.2mm, thickness 15.5mm, front and back double-sided sapphire mirror, achieving the same true function of the original calendar flyback and 3-digit power reserve display.