The IWC Portugieser Constant-Force Tourbillon Edition “150 Years” is a special watch made to mark the brand's 150th birthday. Only 15 of these watches were created, making them rare and exclusive. The case is made of platinum and measures 46mm, and inside is a hand-wound movement called the caliber 94805. This movement has a special feature called constant-force tourbillon, which helps to keep the time accurate. It also has a moonphase indicator, showing the phases of the moon. This watch is truly a remarkable piece and a must-have for any luxury watch collector.