There is a "high grade" and a "low grade". Major differences between the two grades seem to be flat screws on low grade vs hex screws on high grade, date wheel close to the center on the low grade and weaker lume. Having said that I believe there are several grades of low grade (ranging from very close to high grade to s..t). Best advice would be to source from a TD and make sure to get the high grade (hex screws, date wheel, lume, etc.).