I'd say that those are pretty decent results for ordinary quartz movements. As noted earlier, if you were to wear each for at least 12 hours per day, the results would probably be better. This is because it's probably the case that the watch makers calibrate the rate to be at its best when the watch is worn. However, one point made earlier in this thread is incorrect: non-TC movements don't tend to go faster when warmer (or more precisely, this is true for only a small part of the temperature range). If this were true, it would suggest a linear relationship between temperature and rate, and no such relationship exists with quartz. The relationship is quadratic, or in the form of a parabola, with the parabola crossing the 0 sec./month line at two points, one at a relatively cool temperature as the parabola rises, and then again at a warmer temperature after the parabola has reached its maximum height and is now on the way down again. With some movements, the calibration is really good, so that the first point occurs near room temperature (say 70F) and the second near typical 'wearing' temperature (about 86F: ambient temperature blended with skin temperature of about 91F). This perfect calibration is rarely seen, however, in normal quartz watches, and, if you're lucky, you will have the 'wearing' temperature coincide with something close to 0 sec./month.
You have established some good, reliable accuracy values for off-wrist performance. It would be great if you took one watch at a time and wore it for, say, one-two months (perhaps something like 12 hrs. on/12 hrs. off, or better, 14/10) to get its 'wearing' performance. You could use the Stopwatch Method detailed in a sticky on the WUS-HEQ forum, or, if you prefer, just do it by eye.
You have established some good, reliable accuracy values for off-wrist performance. It would be great if you took one watch at a time and wore it for, say, one-two months (perhaps something like 12 hrs. on/12 hrs. off, or better, 14/10) to get its 'wearing' performance. You could use the Stopwatch Method detailed in a sticky on the WUS-HEQ forum, or, if you prefer, just do it by eye.
