In 1990, IWC showcased their first 'Grande Complication' wristwatch at the Basel watch fair. They used Kurt Klaus' perpetual calendar module as a base and added a minute repeater to make the movement even more impressive. The watch had a 42.2mm case and was 16.3mm thick, making it quite large for its time. The reference IW9270-16 belongs to the second generation of Grande Complications and stands out with its new dial design and 'dauphine' hands.