With Patek Philippe Extract from the Archives confirming production of the present watch in 1911 and its subsequent sale on 8 September 1914. It furthermore states that the Geneva Observatory rating certificate was obtained on 11 January 1913.
This watch is one of Patek Philippe's few pocket chronometers presented at a Kew Observatory trial: it participated at the 1913 - 1914 timing contest where it obtained 93 points, tenth overall in its category. At the Geneva Observatory timing contest in 1913 it was awareded a 3rd prize, 29th overall in its category.
Precision timekeeping has always been vital to the scientific community, and in 1873, the first annual chronometer competition was held at the Geneva Astronomical Observatory. Rigorous quantitative internationally recognized testing standards were established. The testing, which initially lasted for 40 days, consisted of placing the watches in various positions and temperature conditions. The prestigious watchmakers Patek Philippe were awarded First Prize in the competition as early as 1884.