Timed my Explorer:

[kyle L]

7 seconds fast a day, but hey I'm ok with that.

[NavitimerNut]

Originally Posted by kyle L

7 seconds fast a day, but hey I'm ok with that.

Thats 42 minutes fast per year!

[kyle L]

Originally Posted by NavitimerNut

Thats 42 minutes fast per year!

It's been dropped a few times, and it probably needs a service. I don't think it has been serviced in a couple of years.

[NavitimerNut]

Originally Posted by kyle L

It's been dropped a few times, and it probably needs a service. I don't think it has been serviced in a couple of years.

Kyle, you need to take better care of your stuff

[mpkRolex]

My AD recommends overhaul if it is more than 5 +/- per day...My Daytona is +3 and my Sub is +2 at the moment as per his testing.

[kyle L]

Originally Posted by NavitimerNut

Kyle, you need to take better care of your stuff

I used to drop it when taking pictures, but now I place a pillow under the ledge.

[ral]

+7 seconds on a single day does not necessarily mean it is outside of specifications.

The COSC defines a Chronometer as follows:

A chronometer is a high-precision watch capable of displaying the seconds and housing a movement that has been tested over several days, in different positions and at different temperatures, by an official neutral body (COSC).

Each chronometer is unique, identified by a number engraved on its movement and a certification number given by the COSC.

Each movement is individually tested for several consecutive days, in 5 positions and at 3 temperatures.

Each movement is individually measured. Any watch with the denomination "chronometer" is provided with a certified movement.

Source

Measure it over a period of several days. When a watch is COSC certified it goes through testing being tested at several different positions. I would recommend wearing the watch (so it is in different positions) for several days and determining any variance based on the average gain or loss over several days.

[GradyPhilpott]

Originally Posted by mpkRolex

My AD recommends overhaul if it is more than 5 +/- per day...My Daytona is +3 and my Sub is +2 at the moment as per his testing.

An overhaul?

I'd think a regulation would be a better place to start.

[Safetrends]

Kyle put your mug back on you avatar I am getting confused here.

[kyle L]

Originally Posted by Safetrends

Kyle put your mug back on you avatar I am getting confused here.

Later.

[snow_rocks]

Hah! My EX1 runs at +1.2 secs a day!

And I wear mine landscaping!

[dr_bypass]

Originally Posted by ral

+7 seconds on a single day does not necessarily mean it is outside of specifications.



Source

Measure it over a period of several days. When a watch is COSC certified it goes through testing being tested at several different positions. I would recommend wearing the watch (so it is in different positions) for several days and determining any variance based on the average gain or loss over several days.

Contrôle Officiel Suisse des Chronomètres (COSC) standard deviation rate of -4 to +6 seconds within 24 hours, tested over a ten day period of chronometer testing, in five positions and at three temperatures. Watches that are within -4 to +6 deviation in a 24 hour period are awarded Official Chronometer Certification by COSC and the movement is engraved with a chronometer serial number. Rolex watches have a self-imposed stricter standard of -1 to +5 seconds per day and hence the designation, "Superlative Chronometer Officially Certified" on the dial. With 86,400 seconds in a 24 hour period (31,536,000 sec/year), a difference of +3 seconds per 24 hours is a deviation of 0.000035 (thirty five millionths) of its daily run resulting in 99.99% accuracy.

[ral]

Interesting, this is my understanding: In order for a mechanical watch to be granted Chronometer status a watch much meet the following criteria an average daily gain of not more than 4 seconds and a loss of not more than 6 seconds per day for the first ten days of testing (+4/-6 seconds per day).

So, is passing determined on a daily basis meaning that on no day should go past +4/-6 or +4/-6 per day over 10 days so that +40 seconds/-60 seconds after the entire test is acceptable.

... after all if you have your watch lying on its back it will run a bit slower, and if you have it lying on its face a bit faster so the results for a single day would not appear to be that definitive.

[Warnsboy]

Originally Posted by Safetrends

Kyle put your mug back on you avatar I am getting confused here.

X2

[wamboozi]

if a watch isn't fully wound will it usually run fast or slow?

[GradyPhilpott]

Originally Posted by wamboozi

if a watch isn't fully wound will it usually run fast or slow?

The word I've heard is that it will run fast. It's said to be a matter of amplitude.

[therolexguy]

Kyle, set your watch with the crown UP at night and see what happens.

[datejust1]

My DJ was at +2!

[Marco-16610]

Originally Posted by wamboozi

if a watch isn't fully wound will it usually run fast or slow?

My rolex fast, other watches slow.

[datejust1]

Originally Posted by therolexguy

Kyle, set your watch with the crown UP at night and see what happens.

x2

[kyle L]

Originally Posted by therolexguy

Kyle, set your watch with the crown UP at night and see what happens.

I will try that.

[Z-Sub]

and you're going to "mature" or grow old faster

[carlhaluss]

Not only do I love my Explorer ( as you already know, sorry if I am getting to sound boring ), but it is the most accurate watch I have ever owned. I don't usually keep a precise check on the time a watch of mine gains or loses. However, just over a week ago I did the whole sych thing with my computer's clock, starting with the second hand a 12 o'clock etc. I have checked the last couple of days, and the watch is running almost exactly 5 seconds slow, so that is less than a second per day, which I think is pretty darn good. Just another reason to like this watch even more. It is more accurate than my Milgauss, although in defence of the Milgauss, it does not get nearly as much wrist time.
Cheers ,
Carl

[JJ Irani]

Originally Posted by kyle L

7 seconds fast a day, but hey I'm ok with that.

Take off the crystal and delete those famous words.....

SUPERLATIVE CHRONOMETER
OFFICIALLY CERTIFIED

JJ

[kyle L]

Originally Posted by JJ Irani

Take off the crystal and delete those famous words.....

SUPERLATIVE CHRONOMETER
OFFICIALLY CERTIFIED

JJ

No way.

[JJ Irani]

Originally Posted by kyle L

No way.

Ask Jocke for some help.......he's always got his blow-torch ready!!

[therolexguy]

Any updates Kyle? Just curious as that way works for me pretty well.

[AndersB]

Originally Posted by GradyPhilpott

An overhaul?

I'd think a regulation would be a better place to start.

x2. A "simple" calibration might suffice. Your AD might be able to do that inhouse.

[kyle L]

So I found out while placed like this:


It gained 7 seconds. I will try crown up.

[TheBluePrince]

Interesting fluctuations. My Explorer is 30 years old, has a movement designed 60 years ago, is not COSC certified and loses 1 second every 3 days.....which i'm happy with