It ran too fast, it gained 7-8 minutes per hour! Unacceptable. I had a Tissot Seastar Automatic and it only gained a minute in 5 days. Was not expecting this from Seiko. I really liked the simple construction and design, I could have it's time adjusted in a jewelry store but wouldn't want to pay more when it should be working properly in first place. Not worth the time. I have to return in.