In 1990, IWC presented their inaugural "Grande Complication" wristwatch at the Basel watch fair. It was a remarkable timepiece that expanded on the foundation of Kurt Klaus' perpetual calendar module by incorporating a minute repeater function. The case measured 42.2mm in diameter and 16.3mm in height, making it a sizeable watch, especially for its time. The reference IW9270-24 belongs to the second generation of Grande Complication watches, which can be identified by its updated dial and elegant "dauphine" hands.