SS#27
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My experience
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 calibrated it to near perfect. The watch has lost 19 seconds in the past 60 days. Performance is better than any of the COSC certified watches I have owned. If you travel quite a bit, as I do, then there is nothing better than the Sonata Silicium. I could not be happier with mine.
This message has been edited by S550 on 2010-03-04 10:33:48
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...
My experience
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
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
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
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