I had to have my SPB143 sent in twice to Seiko. The first time it was running between -13.9 to -50.8 depending on its position. After getting it back the first time, it ran great for a few days and was even tested by the jeweler prior to handing off back to me. Then something caused it to run greater than a minute off/day. After sending it back in (all under warranty) they did a complete teardown and rebuild of the movement and a full regulation. Now it is running +/- 1-2 seconds a day and have not had any significant deviations from this for around 3-4 weeks.