Meanwhile as documented in "Audemars Piguet 20th Century Complicated Wristwatches" the brand produced just 550 complicated wristwatches from 1892 through the early '70s. Before 1951 every AP was essentially unique because the
link idea of producing models hadn't really occurred to its watchmakers
link yet. It's what makes these vintage APs
link so interesting but also so difficult to study.