GMT IIc superb accuracy...after shaky first month of "break in"...

[cafejenna]

My GMT IIc is just about 2 months old. I noticed that during the first month, it ran a tad fast. Fast enough where I was concerned. It seemed that it would gain almost 20 seconds a day and by the end of two weeks, it was a few minutes fast!. However, as time went on it has become incredibly accurate. About 3 weeks ago, and about 4-5 weeks into owning the watch and wearing it daily...it is almost dead on. I set the time in conjunction with www.time.gov on or about December 28th. And right now, it is 725 pm on time.gov and 725 and about 11 seconds on my GMT IIc. I am overly impressed to be honest. I've had rolexes in the past (GMT II, 2005ish and Explorer 2004-ish), neither of which came this close. Just thought I would share for those of you who may be concerned. To me, this proved there is some break in period.

Cheers to all!

[bbqBiker]

My new ExpII spent its first month slow, but 4-5 months later it is much more spot on (well within COSC.) So what the heck is up with "break in" and what is the engineering behind it? If you know and are willing to share, please do. (Hopefully you don't mind me jumping in and asking, cafejenna.) Thx.

[spdracer53]

Originally Posted by cafejenna

My GMT IIc is just about 2 months old. I noticed that during the first month, it ran a tad fast. Fast enough where I was concerned. It seemed that it would gain almost 20 seconds a day and by the end of two weeks, it was a few minutes fast!. However, as time went on it has become incredibly accurate. About 3 weeks ago, and about 4-5 weeks into owning the watch and wearing it daily...it is almost dead on. I set the time in conjunction with www.time.gov on or about December 28th. And right now, it is 725 pm on time.gov and 725 and about 11 seconds on my GMT IIc. I am overly impressed to be honest. I've had rolexes in the past (GMT II, 2005ish and Explorer 2004-ish), neither of which came this close. Just thought I would share for those of you who may be concerned. To me, this proved there is some break in period.

Cheers to all!

i went through something similar as well.

in the first month of owning my gmt iic i had to self regulate it every night.

now after it settled in... after 45 days, my watch is running 30 seconds slow.

overall pretty happy with my first rolex!

[Watch Professor]

It seems that there is a break-in period to allow the lubricants to spread evenly throughout the movement. My GMT IIC was 5 seconds slow for the first month or so then settled down to 1.5 sec. slow per 24 hours. Though I would rather have it fast than slow, I can certainly live with -1.5.

[Aspirin]

My Explorer II is now under the so-called break-in period for almost 3 weeks started from 1/1/2011, average -20 to -21 sec. per week.