For my 214270 it's crown down to lose the most time. But with the 216570 it's +1 spd regardless of position so I'm thinking it's really watch dependent.

 

I have a 214270 as well and can confirm it performs best time keeping during rest with crown down as well. Crown up or dial up gains additional seconds not wanted.

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Best thing to do is check all positions on a timing machine and then you'll know for sure. Or, absent easy access to a timing machine, use the brute force method: Just before you go to bed each night, note (a) the position of the watch and (b) the exact time (to the second) relative to a reference source (such as time.gov). Then check the time again (relative to the same reference source) when you wake up, to see how many seconds it gained or lost in that position while you were asleep. After a week (or 1.5 weeks, if you want to double-check each position), you'll have a pretty good idea. Make sure you wind it fully each and every morning (or whenever you'd normally wind it each day), to keep that variable pretty constant.

 

In general dial up and dial down are the most efficient positions for a mechanical watch and therefore are the most likely to gain time. Crown up and crown down tend to be less efficient so they tend to lose the most time in those positions. This is far from absolute though.

 

Dial up for me gains time on all of my watches - but to varying degrees (my Sinn gains a couple of seconds overnight, Tudors less than a sec - but I know it gains dial up because crown down or up results in slowing down over a few days).

 

Slow down : Crown down (tho crown up also seems to work but does not rhyme
Speed up : Face up

seems to work for me, using these techniques I can keep my exp pretty accurate.

 

Crown down, slow down. Love it!

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FWIW: https://beckertime.com/blog/is-your-rolex-running-slow-fast-or-both/

 

thanks - yes.
I had read this, its a good modern summation of the current general consensus.

 

This is old, so not sure if it still remains valid for modern watches...

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Not sure for others but I've got a 214270MK2 and it's easily the fastest Rolex I have when compared to the 3135 and 3235 movement. I always lay my Explorer crown up and it doesn't seem to slow down at all like the instructions say. So far, I can truly say that the new 3235 is vastly superior. Even after 48 hours without even wearing it's still +/-1 in my case.

 

Positional error does not come into play with a modern Rolex movement.

 

Gravity begs to differ...

 

thanks all.

seems I'm on the right track, id read most of the general positional info and crown up seems to be working well enough.

I may try to be more consistent / regimented about wear times and patterns ( as was mentioned ) but the current splitting of wrist time with my Diver seems to be a good balance.
It keeps both watches wound, gives me variety and keeps both watches around two seconds per week with crown resting up or down..... thats a significant improvement from resting face up which was getting plus 10 seconds per week, still great but noticeably off from my other daily and atomic time.

cheers all , be well.

 

Testing of my newer Rolex has shown that they are far less prone to positional gain/loss than the older ones [where they supply the "guide paper" to positions vs gain/loss]. I do get some slight differences, but with today's move finely tuned movements, the gain / loss and overall accuracy does not make it (for me) a worrisome issue. But still it is fun to at least test them for curiosity sake.

 

Could it be time for a Rolex tourbillion? :roll::-d

 

I find it differs watch to watch..... my in house Pelagos gains slightly on the wrist, then I lay flat at night... over 24 hours it averages out to around +0.5 sec a day

My IWC Aquatimer chrono loses around 3 sec a day on the wrist...
Then I can make it gain overnight laying it flat.

Try a simple app on Android called WatchCheck you can take some rough timings and make a note of its position etc with the timing.... gives you a ball park positional variance you can then modify for your own wear patterns


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I think it’s different from watch to watch. Either time-o-graph it or try them over a day and take note... also on wrist should be different as well.