IWCさんのインスタグラム写真 - (IWCInstagram)「Only a few complications in Haute Horlogerie are as fascinating as the tourbillon. The "whirlwind" involves the balance wheel rotating around its axis in a cage. This not only provides a visual spectacle on the dial. The constant rotation reduces the influence of gravity on the oscillation system and increases the accuracy of the timepiece. The #IWCPortugieser Tourbillon Rétrograde Chronograph (Ref. IW394005) features a flying hacking minute tourbillon at "6 o'clock". Additionally, the model is equipped with a retrograde date display and a chronograph with flyback function.」12月26日 23時00分