Dating girard perregaux movements
Early in the Twentieth Century the advent of radiotelegraphy time signals supplemented the onboard marine chronometer for marine and air navigation, and various radio navigation systems were invented, developed, and implemented during and following the Second World War (e.g., Gee, Sonne (a.k.a.
Consol), LORAN(-A and -C), Decca Navigator System and Omega Navigation System) that significantly reduced the need for positioning using the onboard marine chronometer.
In 2009, the Watch Museum of Le Locle renewed the tradition and launched a new chronometry contest based on ISO 3159 certification.
In 2017 the Observatory Chronometer Database (OCD) went online, which contains all mechanical timepieces ("chronometres-mecaniques") certified as observatory chronometers by the observatory in Neuchatel from 1945 to 1967, due to a successful participation in the competition which resulted in the issuance of a Bulletin de Marche.
Because only very few movements were ever given the attention and manufacturing level necessary to pass the Observatory standards, there are very few observatory chronometers in existence.
Vintage Omega watches from the golden period when the company still manufactured its own movements in-house are one of our specialities.
These observatory chronometers were then sold to the public for normal usage as wristwatches, and some examples may still be found today.
The observatory competitions ended with the advent of the quartz watch movement, in the late 1960s and early 1970s, which generally has superior accuracy at far lesser costs.
Chronometer makers also took advantage of the physical properties of rare metals such as gold, platinum, and palladium.
In horological terms, a complication in a mechanical watch is a special feature that causes the design of the watch movement to become more complicated.