Why as that’s within METAS. ?
Your not getting Os/d with a automatic watch of any brand not even Rolex or Phillipe Patek . ( you may get close but if you want accuracy buy a quartz )
A METAS certification requires that a watch must keep time within 0 and 5 seconds a day. The COSC tolerances for time keeping must be within -4/+6 deviation in any position at several different temperatures.
Where METAS improves on the watch testing standard is that it requires a watch to be resistant to magnetic fields of 15,000 Gauss. METAS also includes an unwound power reserve test and a pressure test for water resistance. Most chronometer brands do their own in house testing for these things but such test are not required to achieve a COSC chronometer certificate.
A METAS certification is for the watch as a whole where as COSC only tests uncased movements for accuracy and temperature tolerances. The METAS certification also carries with it an online report where the customer can view the results for their own watch
Taken from here
https://dailywristcheck.com/metas-vs-coscClick to expand...