My Saxonia Annal Calendar also has accuracy issues and I planned to send it in for service. The pandemic has made me tolerate this - checking and correcting time every couple days as necessary. I wondered if magnetization caused this and went through Hodinkee’s suggestions. It did have some effect,
I have the first edition. Also, my pic is processed for more contrast. Also noticed the layout of the dial lettering. No more flipping the orientation around the dial. Thanks for posting this.