Mads Urup Gjødesen has written a book that contains all the knowledge he himself seeks in a book about Rolex sports models. This is information that is not readily available on the internet but requires many years of research and expertise to gather. Here is your shortcut without spending hundreds of hours online. The book is NOT a "picture book" with a lot of historical chit-chat and model presentations, like most other watch books. Instead, it is a next-level hardcore collection of ALL the information he has gathered over the past 20 years as a passionate collector, watch investor, and pro-dealer. It is unparalleled as the most geeky book on sports Rolexes worldwide and includes all the knowledge a collector needs to avoid making purchasing mistakes. Everything is, of course, documented with plenty of tables and detailed images.