This book is an excellent reference for Patek Philippe enthusiasts and collectors. The layout is a bit confusing but the content is first class. While the reference models coverage is not exhaustive all important models and movements have been included. Blow ups of important movements made in house by Patek Philippe have been presented in exploded view illustrations as well as in photographs. The movement table at the end of the book is useful for collectors. The photographs are excellent and provide a visual history of the watchmaker. This is a book for all levels of watch appreciators. The technical content is competent and the descriptions and illustrations are a treat. The way the book is structured requires some work on the part of the reader if he or she is familiar with the house and is seeking information about a particular watch.