This is a set of books produced by Rolex and titled “Rolex Jubilee Vade Mecum,” dating to 1946 which document all the milestones Rolex has achieved over the years. There were 1000 book sets produced and this set number is 635. There are four books in this set. Book I: Step By Step, Book II: The Evolution Of The Wrist – Watch Chronometer, Book III: The Waterproof Watch Came Into Being, Book IV: The Story Of The Self-Winding Watch. These volumes are in fine condition and measure 5.75×8.375″. The outer box that encloses the books has some wear on the corners and a rip on the spine.