Audemars Piguet: 20th Century Complicated Wristwatches is organized into five chapters. Four of these
link document the history of different types of complications at AP, including a chapter on so-called "double complications," and the last chapter details the rebirth of complicated watchmaking at the firm, beginning with the perpetual calendar in 1978 (AP's first tourbillon of the new era was the famous ultra-thin
link ref. 25643, better known as
link the caliber 2870).