[Amochosto]

Of my 12 Rolex watches (all modern references between 2003-2019) vary between +2.1 and -3.5 seconds per day, worn on the wrist all day and all night, no night time corrective positioning. Three of them average +- 0.4 SPD or better, and all but two of them are within the +2 -2 spec Rolex claims. The least accurate is an 114060 bought almost exactly 12 months ago which looses -3.5 SPD.

All but one of my non Rolex mechanical watches are outside of the +2 -2 accuracy spec set by Rolex.