For the first time in an IWC watch, the Portugieser Constant-Force Tourbillon Edition “150 Years” combines a constant-force tourbillon with a single moonphase display. Available in a limited edition of 15 pieces for each dial variants and cased in a generous but very elegant platinum case measuring 46 mm in diameter, one can choose between a blue lacquered dial ref. IW590203 or a white lacquered one ref. IW5902002. Featuring a dial that seems a little busy at first, the constant force tourbillon takes the center stage at 9 o'clock.