What can I do when my watch gains / loses too much time?

Watch accuracy depends on the type of movement used in the watch. Please refer to the information stated in the instructions for the appropriate accuracy standard. If you have any concerns about the accuracy of your watch, we recommend that you contact an Authorized Seiko Service Center or a Seiko appointed dealer to have the watch inspected. You can find a service center or a dealer in your area at Customer Service Center.

Accuracy of the mechanical watch

What is the accuracy of mechanical watches?
What are the major factors influencing accuracy?
What should I do for better accuracy?
How often should I have the watch serviced?
How does magnetism affect a watch?