Brand new Explorer II accuracy

[Mirx]

I purchased a brand new Explorer 2 Black dial a few days ago and noticed a consistent +9 sec. per day.

Is there a such thing as a 'brake in' period for watch to perhaps slow down a little and stabilize within the COSC requirements or should I be getting ready to send it off to RSC for regulation?

Thanks

[padi56]

I would wait around a month first to see if your watch improves all Rolex watches should run within COSC spec.Try a full manual wind around 40 crown turns wear as normal set time with a reliable time source.Then check daily over a week with same time source average out the gain loss over that week.But one of the most important things with any mechanical watch is consistency, yours has that so its very accurate.And all that may be needed is a little bit of regulation if you live anywhere near London if you pop into the service centre there they would regulate it while you wait.

[SonnyAK]

My new Explorer II is very accurate...It loses about 3 seconds every week, so I'm extremely happy w/it's performance...I'm sure yours could be regulated if it doesn't improve with time. (if the "time" doesn't improve w/time)

Do you lay the watch on it's back, during the night? Some say this will make it gain time...While laying it on it's side at night will make it lose time, so that may be worth a try ??

[RolexPete32]

I sent both mine back for regulation. both running fast. (sub and air-king) It is free anyway (first 2 yrs) and now works well. I hear as I am sure you all know Rolex puts out 800,000 watches a year so they are mass produced for a mechanical watch company. Think about it that is thousands per day. I hear they all need fine tuning by hand to get back in COSC range. I cannot explain why they get the certificate from COSC but I do read that watches can be tuned to make the test in mass production but it takes real human hands to adjust the spring and screws to get it within +2 a day. Sorry if anyone is mad when I say mass produced. I own two myself so it not because I am one of thouse guys who bad mouth just becuase they do not own it! you hear me.

[GrandDaddy]

Originally Posted by Blendhpi

I sent both mine back for regulation. both running fast. (sub and air-king) It is free anyway (first 2 yrs) and now works well. I hear as I am sure you all know Rolex puts out 800,000 watches a year so they are mass produced for a mechanical watch company. Think about it that is thousands per day. I hear they all need fine tuning by hand to get back in COSC range. I cannot explain why they get the certificate from COSC but I do read that watches can be tuned to make the test in mass production but it takes real human hands to adjust the spring and screws to get it within +2 a day. Sorry if anyone is mad when I say mass produced. I own two myself so it not because I am one of thouse guys who bad mouth just becuase they do not own it! you hear me.

You would think they'll be "near perfect" from the factory considering the amount of money that we pay for them. But hey, it's still a Rolex even if it's gaining/losing five minutes a day.

[red wrx]

Originally Posted by Blendhpi

I sent both mine back for regulation. both running fast. (sub and air-king) It is free anyway (first 2 yrs) and now works well. I hear as I am sure you all know Rolex puts out 800,000 watches a year so they are mass produced for a mechanical watch company. Think about it that is thousands per day. I hear they all need fine tuning by hand to get back in COSC range. I cannot explain why they get the certificate from COSC but I do read that watches can be tuned to make the test in mass production but it takes real human hands to adjust the spring and screws to get it within +2 a day. Sorry if anyone is mad when I say mass produced. I own two myself so it not because I am one of thouse guys who bad mouth just becuase they do not own it! you hear me.

I just had my 4 yrs old Sub. regulated at RSC in BH, CA and it was for free. I had to wait 4 hours thou.

[xjeeunitx]

I had the same issue with my Z serial Explorer II. It was gaining aprox. 6-7 seconds per day. It's been about two months since I've had it and now it gains only 3 seconds per day. I would tell you to just relax and just wear it around. I think it just needs time to break in. So just relax and be coooooool. If it keeps doing it after a month then send it back!

[delldeaton]

Originally Posted by Mirx

I purchased a brand new Explorer 2 Black dial a few days ago and noticed a consistent +9 sec. per day.

Is there a such thing as a 'brake in' period for watch to perhaps slow down a little and stabilize within the COSC requirements or should I be getting ready to send it off to RSC for regulation?

Thanks

In addition to the other great responses you've gotten here (and will likely continue to get), you may want to look at the precision-accuracy charts I've kept at various dates and on various watches.

LINK

[Mirx]

This is indeed is a very active and just as helpful forum!

Thank you all again for your prompt responses.

[JimC]

My GMT-II and the Explorer II are both running a bit "fast", but surprisingly similar.

Both are ready for regulation. Both about +15 / day; which in my opinion is *too* fast.

[Thai]

Quick Q...does anyone of you guys have the new EXP II with the Parachrom hairspring?? I think that the M-series EXP II has this new hairspring, right??

Thanks in advance!

[Mirx]

Originally Posted by Thai

Quick Q...does anyone of you guys have the new EXP II with the Parachrom hairspring?? I think that the M-series EXP II has this new hairspring, right??

Thanks in advance!

Yes, mine has the Parachrom hairspring and 3186 movement, confirmed by the RSC technician.

[kokota]

Originally Posted by Thai

Quick Q...does anyone of you guys have the new EXP II with the Parachrom hairspring?? I think that the M-series EXP II has this new hairspring, right??

Thanks in advance!

If I am not mistaking, I believe all late Z serial (Z9xxxxx) and all M serial EXP IIs and GMT IIs (non-C) have the 3186 movement.

[Thai]

Thanks all for your help!!