In 2005, Patek Philippe's Advanced Research Division was created and through innovative materials (Silinvar), complex movements, enhanced accuracy, limited editions and unique design elements, Patek Philippe sought to push the state-of-the-art beyond traditional watchmaking. Patek Philippe’s first Advanced Research model, the reference 5250 annual calendar from 2005, featured a new Silinvar escape wheel developed by CSEM (a micro-engineering laboratory based in Neuchâtel) funded by Patek Philippe, Rolex and the Swatch Group. The Advanced Research collection expanded to include multiple annual calendar models, the exceptional Aquanaut Travel Time, a sound amplifying minute repeater, and a perpetual calendar like the present wristwatch, the reference 5550P

The limited edition reference 5550P was released in 2011 and today is a highly sought after and collectible wristwatch. The 5550P featured for the first time, three new escapement components working together: a Silvinar (a silicon material) balance wheel, patented Spiromax balance spring, and Pulsomax escapement requiring no oil allowing for better precision and longevity.

The present watch is fresh to the market and offered in excellent, hardly worn overall condition and accompanied by all of its accessories. Patek Philippe’s Advanced Research program plays an important role in the history of the brand, and the reference 5550P is an exemplary model demonstrating the most impressive results of their initiative.