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Switzerland -- Bouille and Neuchâtel COSC

G. & E. BOUILLE SA, manufacture nearly 12,000 cases for watches per year. It is independent and 100% autonomous. It works with many Swiss watch brands of highest reputation. G. & E. Bouille SA has a tradition manufacturing watch cases 100% Swiss made and of high craftsmanship.

In 2014, G & E. Bouille SA will inaugurate its new advanced manufacturing facility in Monruz. The latter will be 4 times larger (over 3,500 m2) with industrial automation and machining latest technology systems and also the most modern.

G. and E. Bouille SA presents itself as a "one-stop-shop" for innovation, quality and production for many brands and large watch-making groups. It's very happy that G. and E. Bouille SA can become your partner in the future for the realization of your next luxury watch cases.


COSC, testing generally applies to watches manufactured/assembled in Switzerland.[1] Notwithstanding, the normative standards are set by international agreement and are the same whether they are nominally labeled ISO or DIN standards. Some German, Japanese, and even non-certified Swiss movements can surpass the normative requirements. The Japanese have largely abandoned the accolade, replacing it with in-house testing to a slightly more strict standard as with, for example, the Grand Seiko. On the other hand, the Germans have set up their own testing facility in Saxony at the Glashütte Observatory [2][3] where the DIN 8319 standards, which mirror the ISO standards used by COSC, are employed. At one time the French provided similar large scale testing at the Observatory at Besançon, however, today only a very few watches are currently tested there and carry the accolade "Observatory Chronometer."

The COSC was founded by five watchmaking cantons/department of Switzerland, Bern, Geneva, Neuchâtel, Solothurn and Vaud, together with the Federation of the Swiss Watch Industry (FHS). It encompasses the laboratories/observatories that had been created independently of each other from the late 19th century.

Three laboratories now test the movements submitted by individual watch manufacturers to be granted chronometer status. They are in Biel/Bienne, Saint-Imier/BE and Le Locle. The Saint-Imier and Biel laboratories are almost entirely devoted to testing Rolex movements.[4] Although not all Rolex watches are chronometers, Breitling has claimed that since 2000 all of its production is COSC certified. Omega also has much of its production certified. Thus, based upon the movements used by Rolex, Breitling, and Omega, the movement calibers that obtain most of the COSC certificates [5] are the Rolex 3135 [6] (since 1988) (and variants 3155, 3175, 3185, 4130) and 2235, the ETA 2892A2 [7] (and variants) and Valjoux 7750, [8] each of which operates at 28,800 beats per hour. Tag Heuer [9] and Ball watches [10] both have select watches designated as chronometers which are sent to COSC for certification.

7750 information

valjoux 7750  information