I was testing the TG software (timegrapher), which is at last working properly on my setup. I tested a number of my watches previously tested on a timegrapher and with watchcheck and initially I was surprised that all my watches were doing much worse, apart from my ETA Tissot which was doing +1s as always. To cut a long story short I had just shook then a bit the watches and not fully would then before the measurement. My most accurate miyota was doing +1 s when fully would, but only +7 s when the spring had no tension. An NH35 was doing +5 s fully would, but only +12s when not fully would, another chinese one was the most trivial. +20 s unwound and only+3s fully wound.
It is normal even though I wasn't expecting so high differences.
So the question is do you fully wound your watches before wearing them? If you had a single watch it could be fully wound most times, but if you rotate with sometimes more than one watch in the day I don't think this would be the case.
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