Hi,
In December 2020 I bought a Stowa Flieger Classic 40 and until now have been very pleased with it. Initially, the accuracy really surprised me, it also seemed to be pretty spot on whenever I looked at it without me resetting the time in weeks/months. This was better than I could have imagined.
But recently, I have noticed that it has been well out, like 5 minutes and this seems to be happening over days, maybe a week after resetting.
It has the self-winding mechanism.
What is the best way to test it myself, to determine whether I need to talk to Stowa.
Cheers