The promised accuracy of Calibre 400 Series is -3 to +5 seconds a day, better than the chronometer standard. Before leaving Hölstein, every movement is tested in five positions, as engraved on the reverse of the movement (you can see it by the right barrel) and as in line with our internal standards. Nevertheless, in short intervals, the rate of a mechanical watch can fluctuate. This is normal. Your watch’s accuracy will also depend on wear patterns and on other external factors, such as heavy knocks. For this reason, if your Calibre 400 Series watch is not within the promised accuracy tolerance, you can return it to us and will be regulate it again. In this case, we ask you to contact your nearest Oris Boutique or authorised Oris dealer. Our local service centres will be able to support, too.