Jeffpas 2 Posted September 25, 2015 Report Share Posted September 25, 2015 Hi, a few days ago I bought a new 39mm Explorer. I love it! But it's losing about 5 seconds a day. My question is - should I wait and let the movement 'settle / wear in a bit' before getting it regulated under warranty or is this an old wive's tale and it should run perfectly from the box? If I should wait then how long? I've only been wearing it for 3 days. Thanks. Quote Link to post Share on other sites
Alexon 0 Posted September 25, 2015 Report Share Posted September 25, 2015 My understanding is that a COSC Chronometer certified watch is guaranteed to run within an accuracy of between -4 and +6 seconds per day. Minus 5 seconds is extremely close, so I would suggest for now to check out its accuracy over a two-week period. If it averages between -4 and +6, don't worry about it. Quote Link to post Share on other sites
steelmind 1 Posted September 25, 2015 Report Share Posted September 25, 2015 I agree. Quote Link to post Share on other sites
Fyinll 0 Posted September 25, 2015 Report Share Posted September 25, 2015 It's been such a long time since I bought a new watch that I cannot speak to 'right out of the box' accuracy, but I have become a believer in a 'settle in' period after having my newly serviced watches vary in accuracy for about a two week period. I've found that my watches, worn right from a service and timing adjustment run both fast and slow for about 14 days and then, like magic, stabilize and time out to within a second or two a day. Because I've got more than one watch, the condition also includes some time on a winder. Of course, your mileage may and probably will vary. Quote Link to post Share on other sites
jeniffer 0 Posted September 25, 2015 Report Share Posted September 25, 2015 I'd let it "settle" for a couple months and if it still isn't where you want it to be, ask RSC to regulate it for you. The Dallas RSC happily regulated mine under warranty when it was consistently -2s/d. (It lost time in all positions so nightly self-regulating did not work) It now runs +1s/d on the wrist and can be positioned at night for an equal loss. Quote Link to post Share on other sites
Conier 1 Posted September 25, 2015 Report Share Posted September 25, 2015 I agree with the others on letting the watch run in for a few weeks and then recheck. I have found that it does tend to settle in after about a month or so. Quote Link to post Share on other sites
Ary1ny 0 Posted September 25, 2015 Report Share Posted September 25, 2015 ditto as above.. be sure to not just wind it but wear it, and try different nighttime positional variations.. break in is no myth, the mm300 has a base GS movement and it took weeks to slow mine down (seiko sends them out unregulated). good luck! Quote Link to post Share on other sites
Belle 0 Posted September 25, 2015 Report Share Posted September 25, 2015 This is worst case, in other words any worse and it is not COSC approved Typical is +-3 secs which on a new Rolex I would expect indeed demand In my opinion OP, should return it immediately for proper checking My Rolex gains 1 second per day! Quote Link to post Share on other sites
Johnson 2 Posted September 25, 2015 Report Share Posted September 25, 2015 All excellent advice, thank you gents. I'm going to keep wearing it and see how it pans out before sending it away for a regulation. Because it's borderline and it makes sense there should be some 'settling in' after all it is a mechanical device with moving parts. Quote Link to post Share on other sites
Robert 0 Posted September 25, 2015 Report Share Posted September 25, 2015 Don't forget to try different rest position when you set it down. Your watch may actually be running at +-0 but may speed up overnight due to its position! Quote Link to post Share on other sites
