John -- any given individual watch may perform much better than 15 to 20 seconds per month. This is just what the manufacturer is willing to stand by. We often hear of non-thermocompensated watches being good to much less than this. It depends on the individual watch and its surroundings. A matter of luck, really.Gentlemen, Thanks for the input. The actual watch in question is a CWC R.M. SBS. I'm torn between it and a Marathon TSAR. At least now, I know what type accuracy to expect from either.
According to ETA's specifications for that movement, it is set at the factory to be -0.3 to +0.5 sec/day at a temperatures between 20-30 C.Where can I find a listing of the accuracy for ETA quartz movements? Specifically, the 955.122. I know is not a HEQ, but I was hoping someone here might have such information.