IWC Schaffhausen Portugieser Constant-Force Tourbillon Edition "150 Years"

The IWC Portugieser Constant-Force Tourbillon Edition "150 Years", reference IW590203, has a 46 mm platinum case. This special edition has a tourbillon with an integrated constant-force mechanism. The case measures 13.4 mm thick; manual-winding calibre 94805 has a 96-hour power reserve and 41 jewels. The blue dial has a power reserve indicator and a moon phase display under arched-edge sapphire glass. The watch is on a black alligator leather strap by Santoni. The case carries a water-resistance rating of 30 metres. The calibre has an operating frequency of 18,000 vibrations per hour.