Clueless...

[SCA]

+5 seconds in 24 hrs on a recent RSC service. Good or Bad?


BTW, the watch is set to time.gov

[The GMT Master]

It's within COSC specs, so I wouldn't worry about it

[HL65]

X2!!

[Route 66]

I know it would be nice for your watch to be as accurate a quartz watch but that will never happen. I went through the same thing; my Explorer gains 4 secs./day. I just decided to lower my expectations, and now I can live very well with the inaccuracy, and now I never have to worry about a battery dying at the worst possible time.

[jekuo]

Isn't +4/-6 the acceptable range? So it is within spec.

[Dan Pierce]

Originally Posted by jekuo

Isn't +4/-6 the acceptable range? So it is within spec.

Those are chronometer standards. Personal standards can be much more stringent. A consistent +5 seconds a day is phenomenal performance.
dP

[sleddog]

Originally Posted by Dan Pierce

Those are chronometer standards. Personal standards can be much more stringent. A consistent +5 seconds a day is phenomenal performance.
dP

I have to agree with Dan.....

After a week, you'll only be 35 seconds early to that important meeting!!

[SCA]

Originally Posted by sleddog

I have to agree with Dan.....

After a week, you'll only be 35 seconds early to that important meeting!!

The clock in the car is set 5 minutes ahead to handle that.

[tictocChuck]

Both Mechanical and Quartz watches can be certified by COSC (Contrôle Officiel Suisse des Chronomètres), although to different standards. For Mechanical watches it is an average daily rate variation of -4/+6 seconds per day. Each uncased movement is individually tested for fifteen days, in five positions, at three different temperatures. See the following link for more info if interested:

http://en.wikipedia.org/wiki/COSC#cite_note-0

As well, the following link is an interesting read on watch accuracy in general (cuts through the mystery):

http://chronocentric.com/watches/accuracy.shtml

My own experience with my GMT IIc on & off the wrist over 14 days has been -15 seconds which is roughly -1 second a day, so I'm satisfied.

When I'm not in the mood to fuss with a watch, I have my standby Omega 300M quartz (3 year battery life approx) which is super accurate and looks great too! Just strap it on and go!

Rolex uses "Superlative Chronometer Officially Certifed" as a marketing spin, but it really just means a COSC certified Chronometer (All watch makers have their movements tested to same COSC standard). Other watch makers may not state such on the face of their watch, but it can still be a certified chronometer (note: don't confuse the term with "chronograph" which is a timepiece or watch with both timekeeping and stopwatch functions, which may or may not be a COSC certified chronometer, the Daytona is both a Chronometer and Chronograph).

Interesting Facts:
Over a million official chronometer certificates are delivered each year, representing only 3% of the Swiss watch production.
COSC certificates are generally not provided by the watch makers (Breitling does, but Rolex & Omega do not, although apparently Omega can provide the certificates if requested).

Cheers!

[Tools]

Personally, I don't care what COSC "standards" are..

If my Rolex is 5 seconds or more off, I get it regulated.. It is a much better performer than that...

(Also, it's -4/+6, not +4/-6)

[Z06]

Originally Posted by Tools

It is a much better performer than that...

I would agree front personal and recent experience...You've heard me say, and its true for mine, my GMT is off less than a sec since before Thanksgiving!

[SCA]

Originally Posted by Tools

Personally, I don't care what COSC "standards" are..

If my Rolex is 5 seconds or more off, I get it regulated.. It is a much better performer than that...

(Also, it's -4/+6, not +4/-6)

I just received the watch from the Dallas RSC last Saturday. I would hate to send it back, but I am not happy about a few other things so I may have too.