I just purchased a Tag Formula 1 from WBK, and I love the look and feel of the watch, and am quite happy with it and don't necessarily need to change anything. That being said, the movement doesn't work like the original. The 2:00 dial counts the seconds, the 10:00 counts the minutes on the chrono, and the 6:00 just moves with the date, and the chrono does work. The original has 1/10th seconds at 2:00 position, minutes at 10:00, and running seconds at the 6:00 position. I can live with it as it is, but the more I think about it the more I wonder if it is possible to swap the movement for the correct one. I was looking around a bit and saw an ETA quartz chrono: ETA G10.21A that looks like it would fit, but I'm not sure. Would the hands from the current movement fit the replacement? Would the replacement movement fit in the watch? Probably the most important question, is it very difficult to replace the movement in a quartz watch.