This book was born from the passion for one of the most iconic timepieces ever made: the Rolex GMT-Master ref. 1675, in its fascinating early production phase with Gilt dials. It is not just a technical manual or a list of details, but a journey blending history, research, and direct observation. Each component – dial, case, bezel, crown – is presented as part of a larger mosaic, closely tied to the historical context in which the watch was created and evolved.The aim of this work is to bring clarity and structure by comparing examples and documents, offering insights both to seasoned collectors and to those approaching this field for the first time. The result of the shared knowledge and passion of three authors, Fabrizio Artioli, Marco Di Falco, Andrea Piccinini, this volume is intended as a tool for study, reflection, and dialogue on a model that has left an indelible mark in watchmaking history.