Accuracy of Ulysse Nardin’s non-COSC chronometer watches

Hi! I have a question about the accuracy of Ulysse Nardin’s non-COSC chronometer watches. As I travel quite a bit, I am considering purchasing either a UN GMT +/- Big Date or a UN Michelangelo UTC Dual Time. Before spending several $’000 on a watch, I was wondering what sort of accuracy I could expect from either of these watches. (I couldn’t find anything on the UN website, however, I note for example that the IWC website states that their watches leave the factory adjusted to within 0 and +7 seconds a day.)
Any feedback from current UN owners as to accuracy will be much appreciated!
Stuart

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My experience

By: SS#27 : March 4th, 2010-10:29

I believe UN’s official position is that variations of 6 – 12 sec/day are normal. However, my Sonata Silicium is not COSC certified. It ran a very consistent +3/sec per day when I first received it. I sent it to the US service center and they ...

I wouldnt worry about it too much

By: gazoz : March 4th, 2010-14:58

Cosc is overrated any good watch company makes there watches to even better than cosc standards and your UN will run fine too i have a BP which is not cosc and runs 3 sec a day i believe that a lot a watch companies use the Cosc tag to promote and market ...

Depends who you talk to

By: cc.powell : March 5th, 2010-04:26

When I bought my JLC Master Control Calendar I asked the AD if it was COSC certified like my Rolex. He said it wasn't but JLC and "higher end" manufacturers don't need to get COSC certification to prove accuracy as their standard accuracy is better than t...

My Pam had the JLC too

By: gazoz : March 5th, 2010-13:25

and ran about 3 sec s a day and it wasnt cosc and was always accurate has your always run at 8 secs ? might need to be checked over