For the first time ever in the Portugieser family, the Portugieser Tourbillon Rétrograde Chronograph with the IWC-manufactured 89900 calibre brings together a flying tourbillon at “6 o’clock” with a retrograde date display and a chronograph with flyback function. The pallet and escape wheel have a special coating. The latter reduces friction and improves the energy flow in the movement. One model is offered in 18-carat Armor Gold®, a specially hardened version of 5N gold. A second model comes in platinum.