Patek Philippe introduced the reference 3878 in 1981 and it was in production until 1998. Patek made around 500 examples of this reference.

In watchmaking, from the case to the movements, engraving is one of the decorative techniques that form the soul of a luxury watch. It is a savoir-faire that has been passed down from generation to generation. The engraver cuts the metal to create patterns that give the entire movement the rare elegance and emotion that distinguish a fine watch.

Often hidden in the depths of the case, the subtlety of this decorative work is nonetheless unveiled in skeleton watches. Designed to highlight the beauty and architectural complexity of their movement, these models with transparent case reveal the beauty of the pieces which are enhanced by the ornamental delicacy of the engraving.