Centigraphe Sport, Aluminum 47100 Its architecture is inspired by

Its architecture is inspired by mid-century Patek Philippe observatory chronometers

widely agreed to be rarer than the 25 initial pieces for Beyer

2915 Speedmaster

only ever available in boutiques

This A Series features a warmer

Centigraphe Sport, Aluminum 47100 Its architecture is inspired byAn early Centigraphe Sport, with case and calibre manufactured entirely from aluminum. Debuting in 2011, the Centigraphe Sport was the world's first wristwatch where the case, calibre, and bracelet were all made of aluminum. It remained in production for just three years, succeeded by a heavier titanium model. These early pieces weigh a remarkable 55 grams and are still capable of measuring the Centigraphe's hallmark one hundredth second interval.