If you can wear it for at least 7-8 hours a day, or you will stop it secretly, it may be because your watch needs oil washing. Of course, the watch you just bought generally doesn't say that it needs immediate maintenance and oil washing, but it may be that the watch you bought has been at the counter for a long time, and some watches in stock may have been at the counter for a long time. If it has not been sold at the counter, it has been preserved for several years, because the oil inside is natural.