Although featuring a constant force tourbillon, moon phase and a four-day power reserve, the Portugieser Constant-Force Tourbillon is a dialled down version of the most complicated (and expensive) IWC wristwatch ever made, the Portuguese Sidérale Scafusia introduced in 2011.
Powered by the same calibre 94800 found in the discontinued Ingenieur with the same features, the Portugieser Constant-Force Tourbillon has an aperture at nine o’clock that reveals the centrepiece of the movement, a large tourbillon regulator.












