Now, depending on things like temperature, variation in quartz crystal performance, and other imponderables, you may very well get one second a year performance out of a watch not rated to that accuracy. I have a Citizen Eco-Drive Skyhawk that's probably nine or ten years old and when I first got it I measured its accuracy over the course of a year and it was slow by three seconds over 365 days. But there is a big difference between getting lucky in terms of performance, and being able to guarantee performance over that long a period. The industry standard practice for AT quartz crystals specifies the angle of deviation of the cut from the Z axis of the crystal (for instance) to within 0.0042 of a degree and the angle of the cut can be varied slightly in order to alter the rate stability of the crystal in a given temperature range to the desired spec. (Tighter tolerances will produce more consistent performance, but as is usually the case, it's more expensive.) This combined with some of the other technical features of the Caliber 0100 make it, at least for now, technically unique.