COSC Standards

[Annan]

TRF has had numerous threads regarding questions on the accuracy of our beloved Rolexes and with most responses including a reference to the COSC standard of -4/+6. I stumbled upon this short article that helped to enlighten me a little about the COSC. Thought some of you might find this of interest too.

[kilyung]

What article?

[Annan]

Sorry....got so excited I forgot to include the link: http://hiro.alliancehorlogere.com/en...onom%C3%A8tres

[77T]

Cant think of a better one than this...

One and the same...

http://en.wikipedia.org/wiki/COSC

[padi56]

Originally Posted by Annan

TRF has had numerous threads regarding questions on the accuracy of our beloved Rolexes and with most responses including a reference to the COSC standard of -4/+6. I stumbled upon this short article that helped to enlighten me a little about the COSC. Thought some of you might find this of interest too.

The main problem with todays COSC test is they only test the bare uncased movement no dial hands or even winding rotor are present at testing.Special dial hands and because of the vast amount of movements tested by Rolex they have there own machine there.The bare movements are wound up by a machine and tested by time laspe computer linked photography.And the certifaction is only at the time of testing,and today most movements with careful regulation could pass todays COSC test today IMHO its more marketing than anything.

[Annan]

I completely agree, Padi.

[kilyung]

Isn't there a more rigorous certification than COSC?

[padi56]

Originally Posted by kilyung

Isn't there a more rigorous certification than COSC?

Not for Swiss movements of the Rolex size now before the COSC was founded there were Swiss tests to a slightly higher standard.I think the European DIN Standard and the Japanese standard for mechanical chronometers is to a slightly higher standard than the Swiss.But both test there watches in the case that will be after testing be the same for retail sale.

[Annan]

Here's a link to the COSC for what it's worth......doesn't reveal much more info IMO. http://www.cosc.ch/