Participate in a 5 day accuracy test

[veefour]

Just set my 16800. 19.00 local time, 14.00 eastern time.
See you on friday

[JohnEaton]

I'm in too, 16610LV

[entropydave]

me 3!
18:34 UTC - nearest choice I get here in the UK (we actually went forward and hour a couple of days ago!)

[Mrdi]

I'm set
Pacific time

Mrdi

[f16570]

Count me in will set at 2000 against accurist.123

[Warped]

Does it matter if we wear our watches upside down?

http://www.rolexforums.com/showthread.php?t=32938

[astcell]

Make it interesting. Once you find out how far off you are, do NOT adjust the time with the crown, but rather try to speed up or slow down the watch by laying it out different each night until you get it back on the correct time!

[entropydave]

Originally Posted by astcell

Make it interesting. Once you find out how far off you are, do NOT adjust the time with the crown, but rather try to speed up or slow down the watch by laying it out different each night until you get it back on the correct time!

Hmmm no - this is a different test and should perhaps be done after this one - this one should be "regular usage" IMHO, but noting if one takes it off at night and if so what way up you would NORMALLY leave it -I know that I always leave mine dial up - just naturally goes that way if I take it off at night which I do some nights and not others.

[GMTJOHNNY]

We are scientists so of course we will participate- if not too late.

[Green Sub]

Originally Posted by GMTJOHNNY

We are scientists so of course we will participate- if not too late.

Not to late at all. The test doesn't have a start date or end date, just a span of 5 days / 120 hours.

[JohnEaton]

Originally Posted by JohnEaton

I'm in too, 16610LV

Okay added my Daytona 116520 and a Seiko Kinetic Dive 200 Meter also

[bewithabob]

count me in with todays DateJust
9.02.20 monday

[sbakar]

While I can't stay on for that long, I have entered a friend's 5500 Air-King from 1988.

Fully wound, set to time.gov, this Monday at 22:25 EST.

[b18prl]

count me in!
my gmt2-c sync at 10:30pm est on monday 3/31/2008

[bchan]

Set my fully wound watch at 22:40 hrs on 3/31. Watch is one month old GMT II 116713 (TT) bought on 2/28/08.

[dkpw]

Lovely watch bchan!

Lee - I try to be as scientific as possible. Coming from a Tag quartz I'm still adjusting to "mechanical time."

[Warren]

Warren's Reports.
EXP II, M series in watch winder, never serviced,

Report 1:
20 min. clockwise swiveling and than stop for 40min. clockwise @4320 rounds per day
11 sec lost per 4 days (without full wind before).

Report 2:
15 sec. swiveling clockwise and than 15sec. swiveling anticlockwise @4320 rounds per day
6 sec lost per 9 days (without 20 times of manual wind before).

[Jedi]

Hi Warren.

Those are impressive rate results, but just a few thoughts on winders (I use one myself):

- winders do not generally (not that I've seen anyway) allow a watch to rest in the horizontal dial up position (which is one of the positions the balance is adjusted for)

- the Rolex movements wind in both directions so it may be beneficial for you to set the winder on a CW and CCW cycle so that wear is even on the movement should you choose to leave the watch in there for an extended period... just noticed that you did set it for both directions... in that case, it means that the two directions even out some of the losses you were experiencing with winding in only one direction! Cool!

Nevertheless, impressive rate results.

[Jedi]

deleted due to duplication

[ratmotortom]

TT sub wound and set.

[Warren]

Hi Lee,
Yes and agree. I actually saw some winder which place the watches horizontally. Maybe placing horizontally should have the best results.

I am sorry for a typo in my report.

Report 2:
15 sec. swiveling clockwise and than 15 sec. swiveling anticlockwise @4320 rounds per day
6 sec lost per 9 days (with 20 times of manual wind before).

Originally Posted by Jedi

Hi Warren.

Those are impressive rate results, but just a few thoughts on winders (I use one myself):

- winders do not generally (not that I've seen anyway) allow a watch to rest in the horizontal dial up position (which is one of the positions the balance is adjusted for)

- the Rolex movements wind in both directions so it may be beneficial for you to set the winder on a CW and CCW cycle so that wear is even on the movement should you choose to leave the watch in there for an extended period... just noticed that you did set it for both directions... in that case, it means that the two directions even out some of the losses you were experiencing with winding in only one direction! Cool!

Nevertheless, impressive rate results.

[fly-dad]

Originally Posted by fly-dad

I know my GMTIIc runs slow. I guess we'll find out how slow in five days.

Day two and I have already lost 5 seconds. I lay the watch flat with hands up to no avail. Three more days...

[Andad]

Originally Posted by Warren

Hi Lee,
Yes and agree. I actually saw some winder which place the watches horizontally. Maybe placing horizontally should have the best results.

I am sorry for a typo in my report.

Report 2:
15 sec. swiveling clockwise and than 15 sec. swiveling anticlockwise @4320 rounds per day
6 sec lost per 9 days (with 20 times of manual wind before).

How can it wind up if it sits horizontally?

4350 revolutions /day seems excessive.

Wear it on your wrist and it will be completey different in my experience.

[Overkill]

Day 2, I've gained 14 seconds. I wear it all day and lay it in crown down position at night. That's weird, last time I checked, my watch was only 5 seconds fast everyday, not 7!


edit: I run 30-45 minutes with my watch on everyday, if that has any effect...

[entropydave]

...spot on still! Even when I hold the AK right next to the monitor so my eyes can flit instantly from dial to screen...I can't see a difference!
Who needs atomic clocks?! Pah!

Worn 24 hours - not taken it off save to do the washing up....and to give it a quick wash itself yesterday in soapy water.

...however this is all alittle academic as I see that if one goes to difference sites such as wwp.greenwichmeantime.com you'll see a difference - one of them is wrong! I think that network lag is a factor here and to be honest I think that the accuracy at best can only be measured to within +/- 1 sec. I guess this is the reason for us all using the same site.

[Warren]

Originally Posted by directioneng

How can it wind up if it sits horizontally?.

Agree, I aware that point before I went sleep last night. I saw that winder just at a glance during window shopping. Must have some tricks that I didn't aware. Maybe just a watch box.

Originally Posted by directioneng

4350 revolutions /day seems excessive..

Just quoted from winder manual, not actually counted.

Originally Posted by directioneng

Wear it on your wrist and it will be completey different in my experience.

I cannot agree more. I experienced a two-day wear with reading ahead the actual time. I did not have a chance to wear on consecutive 5 days due to job nature. I am trying to ask my wife to do so.
But I am afraid she may fall in love with my EXP II.

[Jedi]

Originally Posted by fly-dad

Day two and I have already lost 5 seconds. I lay the watch flat with hands up to no avail. Three more days...

Such a result is still impressive, although the general preference is to have it run fast rather than slow.

A couple of suggestions:

- give it a full wind up
- try laying it in different orientations each night and check against a known deviation at a particular orientation

[Jedi]

And after 3 days, my ExpyII is +1 second overall, worn everyday, dial up at night.

Incidentally, my FP Journe Chronometre Souverain is +/-0 seconds after a week.

[marshallr47]

I'm in.

[WES]

I posted this here a while ago but I stick it in this thread to show my results

I have seen on this forum people talk about the accuracy of their watches, +2 and -1 and how they measure up to COSC standards; this has prompted me to conduct my own little study of some of the watches I own.
The COSC test is conducted over a period of sixteen days and is quite complicated; the test requires the watch to be wound fully every day, the watch to be placed in 5 different positions during the course of the test, recording the variation in rate due to temperature, plus other factors. At the end of the test the watch should maintain an average accuracy in the range of -4 to +6 seconds a day. I have neither the time nor the ambition to conduct such a test. In conducting the accuracy test of my group of watches, I decided to keep it relatively simple. I set the watch to clock on my computer, which I synchronized to the U.S. Navy Atomic Clock and updated it daily. I then wore the watch for three days, which would keep it fully wound and place it in different positions. I then let it sit face up for one more day. I recorded the difference between the watch and my computer, then dividing by four; this gave me a daily average. I know this is not a very scientific test but it was just to get an idea how my watches were doing. I though some of you might be interested in my findings.
I have five Rolex watches that are officially certified chronometers plus a Tudor watch with an ETA 7750, 25 Jewel movement witch should be capable of maintaining a respectable degree of accuracy. I had some surprising results. The Explorer I is brand new and I’m not sure what a proper break in period is, if there is such a thing, but at +14, it is outside of chronometer specifications and very disappointing. It is still under warranty and will be adjusted so I’m overly concerned. The Explorer II is an F serial number, 2004, and is running -3; this is close end of the COSC specs. The Submariner is a real surprise, it is an S serial number, 1993, which I bought used in 1998. I have never had it serviced and running at +2, is amazing. The Yachtmaster, a Y serial number, 2003, was a disappointment, running +5. I was hoping my 18K Gold beauty would be a star and be right on but it came in almost at the end of plus range. The ladies Zephyr is another shocker with a W serial number, 1995, it too was at +2, I couldn’t be happier with those results! My wife was smiling too! The Tudor Chronograph averaged +8 seconds per day, while outside certified chronometer specs, not bad and with a little adjusting may be capable of becoming a WES-Massachusetts Certified Chronometer. Well there you have it, now you guys can do some tests on your prized possessions. You could post it here and maybe we could get a giant average. WES
Just to finish the story, I took my Explorer I to my AD; his watch repair technician did his magic and it’s now running +1! Another happy ending!

To end this story, I must include that I have since sold the Explorer I and the Tudor chronograph