Things to know about manual wind watches we sell: Manual wind and automatic wind watches use springs and gears with a rotating balance wheel to keep time. Because of this they may not be as accurate with keeping time as a battery powered quartz. The manual wind watches we sell are tested for at least 24 hours and keep reasonably good time, or we don’t list them. Please be aware that you may have to adjust the time on your watch every so often. If for some reason you are unhappy with your watch, we offer free 30 day returns for a full refund.