I follow checking no deviation was caused when the crown was pushed to the closed position as it happens sometimes with some movements.
Then I follow visual checking the deviation in following days. Please don´t think I´m crazy about these controls. I just do it with a new purchase, and from time to time with any watch I suspect is not working well and needing a service.
This particular watch surprised me because I couldn´t detect any deviation visually during such a long period.
As I change watches about every two or three days, I can´t find this kind of accuracy with a mechanical movement in my collection. I haven´t carried such a long trial with them.
Thank you for viewing my post! Cheers. Abel