Crown up/crown down

[Dirt]

Originally Posted by Boopie

I know Rolex recommends crown up versus crown down for positioning a watch at night, if you want to affect the speed (and of course it applies to automatic watches in general).

My question is, does crown up or down really only come into play if you’re leaving the watch for hours at a time (eg at night), or is it cumulative throughout the day? I’ve never read anything about this, just advice on how to position your watch at night, when it’s resting for hours.

I ask because I’m left handed, and wear my watch on my right wrist. Obviously the Rolex movement is designed anticipating that it will be worn on the left wrist.

So, if most of you have your Rolex crown-down when your arm is down at your sides during the day, but my watch’s crown is up, does that make a difference? Obviously no one stands around for hours a day with hands down at their side, but it does occur many times throughout the day. So, assuming normal use, i.e. we are moving our arms throughout the day, is there any impact on timing of watches worn on the right wrist versus the left wrist?

The movement in the watch is not necessarily designed to primarily be worn on the left wrist.
It's simply that it's only tested for and adjusted in 5 out of the 6 potential positions which favour a left wrist scenario.
GS include all 6 positions in their testing and adjustments.

To add further context, Pocket watches traditionally used to be tested and adjusted in the 3 most likely positions that they will reside in whilst sitting in a pocket. They are crown left, crown up and crown right.

Everything affects accuracy and it's not limited to resting position with temperature being another main factor(especially when off the wrist and not influenced by body temp).
Whilst a major factor, anecdotal evidence suggests resting position is less significant in modern times with the most significant resting position variations remaining dial up and dial down because the Balance staff is in the vertical plane.
When positional change occurs, it takes a little while for the Balance to settle into a consistent rhythm.