Watch accuracy meter
https://lemmy.world/post/15484760
Seiko SNKL47 -56 seconds a week. https://play.google.com/store/apps/details?id=com.watchaccuracymeter.app [https://play.google.com/store/apps/details?id=com.watchaccuracymeter.app]
Does it change much in various orientations?
Oris Artelier S