Patek Philippe Men's Calatrava 1961 Vintage 18K Gold Yellow Gold Automatic Wrist Watch, with Circa Movements. (Pre-Owned Model 3444) Remaining faithful to the spirit of the art of fine watchmaking, Patek Philippe has always attached a great deal of importance to the quality of its movements. The brand is part of a small circle of authentic manufacturers who all develop and manufacture their own calibers. A demanding process that combines ancestral savoir-faire with avant-garde design, manual expertise, and cutting-edge technology. Patek Philippe manual winding movements reflect one of the key principles of watch manufacturing: integrating maximum complexity into minimum dimensions to create a case that is exceptionally slim and timelessly elegant. The epitome of fine horological construction, Patek Philippe’s movements are also distinguished by their refined finishes. Ref# PP3444.