Chopard

Chopard+PP, welcome to PuristSPro Chopard forum...

 

The L.U.C LunarOne is Chronometer, COSC-certified.  The window of the timing (per COSC) must be inside -4 to +6 seconds per day (absolute 10 seconds window).

However, normally L.U.C finetune it always to + (gain).  Its better so we will not be late for appointment if we continue using without adjusting for a month.

Your reference clock or time is important when making the comparison. Atomic clock  reference will be good.

You may wish to document it for 1 week ( wearing) and another 1 week (not wearing, ensure it was wound like 60 turns every 2 day)  to see what is the gain/loss with the previous day.

For example( with reference to atomic clock with)

1. Day 0 (start date)   + 1
2. Day 1                        + 2 , diff is + 1 sec.
3. Day 2                        + 2,  diff is 0 sec
   
4. Day 3                        + 1, diff is -1 sec
5. Day 4                        +2, diff is + 1 sec
6. Day 5                         +3, diff is +1 sec
7. Day 6                         +1 , diff is -2 sec
   

If your daily differential as above, your range is -2 to + 1 sec (absolute window of 3 seconds), your watch is in a working band of 3 seconds!
It is a PRECISE piece not just accurate.  Consistency is what we are looking for.

Hope I answer your question.

Kong