1. Over the first 10 Days the average daily rate must be within -4/+6 seconds 2. Mean variation in rate cannot be higher than 2 seconds in any single position 3. Greatest variation in rate between any 2 days cannot be more than 5 seconds in any single position 4. The difference of the rates in the vertical and horizontal positions cannot be more than -6/+8 seconds 5. The difference between the main daily rate and any individual rate cannot be more than 10 seconds 6. Variation in temperature cannot be more than 0.6seconds per degree 7. Difference between the mean daily rate of the first two dates compared with the the last two dates cannot be more than 5 seconds.There are three labs all located in Switzerland that do the COSC certification: One in Geneve, one in Le Locle, and one in Biel/Bienne. The entire testing process takes 15 days, and the watches are tested in five positions. The watches are tested as movement only, and do not come with hands or anything. Automatic movements have the rotors detached during testing and three temperatures are tested as well. 23 Degrees Celcius is the main temperature tested.15 Days for Mechanical watchesDay 1 : 23 Degrees Celcius - Vertical - 6 o’clock upDay 2 : 23 Degrees Celcius - Vertical - 6 o’clock upDay 3 : 23 Degrees Celcius - Vertical - 3 o’clock upDay 4 : 23 Degrees Celcius - Vertical - 3 o’clock upDay 5 : 23 Degrees Celcius - Vertical - 9 o’clock upDay 6 : 23 Degrees Celcius - Vertical - 9 o’clock upDay 7 : 23 Degrees Celcius - Horizontal - Dial DownDay 8 : 23 Degrees Celcius - Horizontal - Dial DownDay 9 : 23 Degrees Celcius - Horizontal - Dial UpDay 10 : 23 Degrees Celcius - Horizontal - Dial UpDay 11 : 8 Degrees Celcius - Horizontal - Dial UpDay 12 : 23 Degrees Celcius - Horizontal - Dial UpDay 13 : 38 Degrees Celcius - Horizontal - Dial UpDay 14 : 23 Degrees Celcius - Vertical - 6 o’clock upDay 15 : 23 Degrees Celcius - Vertical - 6 o’clock up
Moi, ce qui me gonfle, c'est de devoir faire pile et étanchéité tous les deux trois ans, qu'au bout de dix ans t'as finalement acheté deux montres quoi...
NB: j'me disais, ça pourrait être sympa, une montre à courroies
Bon sinon Glotton, dans les 400€ un truc sympa, cadran rond assez gros (j'ai un poignet un peu costaud), pour aller bosser tous les jours, tu as un penchant ?
Moi qui n'y connais rien en montre automatique, je suis surpris de lire vos commentaires sur le décalage qu'elles peuvent avoir. Je ne pensais pas que ça pouvait dévier d'autant par jour.
Grand Seiko Inspection Standard. This is the Japan version of COSC Certification. The Grand Seiko test has more rigid standards and requires a higher degree of movement accuracy than a Swiss COSC Certification test. (See the April 2012 Edition of Watch Time Magazine for more detailed information.)