Chronometer & Accuracy

That’s not terrible, -4/+6, better to be running fast anyway. If it gets worse, you could take it to your AD if they have someone who can regulate.

Do you take it off at nite?

If you haven't already, try it at different resting positions overnight. It stands to reason that if it's averaging +4 but you're seeing a higher number at night, there must be a lower variance in another position to bring the average down.

Makes sense.. Will try crown down or up

Yes.. It's dial up during night on my stand

Placed flat.. Yes I get that mechanical watches are not meant to be very accurate but given the fact that's it's a chronometer expected better results 😀

Ahh I suppose that temp changes may affect the consistency of timing because the watch metalwork, lubricants expands/ change from the heat of your body and cools at nite on the stand.

Wearing your watch constantly could smooth out the time keeping….

My Zulu time is spot on with zero deviation when on wrist. Off wrist, at a 45 degree angle in my watch box, it is -5 seconds/day.

My Oris Aquis is +8 seconds/day on wrist, but +15 seconds when dial up. +2 when vertical. Position matters.

Thanks.. Is your Aquis the calibre 400 or Sellita

Ok.. Always thought that a chronometer certification would have taken care of all that.. Maybe I was wrong

My Zulu Time is running +4 seconds / day in a very consistent way, regardless of wear / rest time, which I know is within specs, although I have cheaper pieces that are actually more precise (luck of the draw, I guess)

In your position I wouldn't be happy about the inconsistency and I would send it for a regulation while it is still under warranty.

I just did that with a Seiko SPB143.

That watch is chronometer rated, so if it was running outside of the COSC spec of -4/+6 SPD it should be covered under warranty. Given that you are getting real world on the wrist ratings within that range, I don't think that the AD would consider it as warrantable, but it's probably still worth taking it in to have them check out the rates on a timegrapher to see if there are any potential signs of an issue that might suggest a need for adjustment.

Thanks..Those are my thoughts too.. Shall take it for checks..

Yes.. I shall get it regulated.. I have a Sinn 104 that beats the hell out of the chronometer 🤣

I’m super excited to see the 39mm version of this when it’s out. Can’t pull off a 42mm…

Wow.. That's pretty detailed.. I never check the accuracy on my Seikos as don't want to be disappointed 🤣

Caliber 400. It’s supposed to be within COSC, but is not certified.

There’s another small detail that makes the 39 better: the date window is centered at the 6 o’clock. I believe they are using the same discs to save money and the 42mm is ever so slightly high.

Individual positional tolerances of chronometers are MUCH less strict than +6/-4 which is only for the average over 5 positions.

For example METAS Master Chronometer candidates of that size must be within 14s for slowest to fastest position. In other words, your watch could gain 10s face up and run flat 0 in the other positions, resulting in +4s while worn (on average) and it would not just be within COSC spec but also METAS Master Chronometer.

I rarely wear the same watch for more than 1 day, in-fact a may wear 3 in one day

However i would like them to be as accurate as possible, but aint loosing any sleep over it.

GS quartz or the atomic clock on your phone if you care that much 😉

or buy more & rotate faster, no time to measure 🤣

what are you using to measure & record?

Looking at timegraphers at the min, as a way to establish if service is required

and the watch too?

I’m probably going to get a timegrapher soon enough, I’d like to try to learn regulation.

My app is a very simple one. ‘Twixt’ is a few bucks and just uses photos that you adjust to take serial photos of your watch. It requires a second hand, sweep or subdial. No Bel Canto or watch without seconds. If you know spec range for movement then this app lets you know precisely if it doesn’t meet that spec.

Take photo, wait >24 hours, take photo. It does the the calculations to give s/day, averages, and total seconds gained or lost for however many days you record it. For my 413 Sakura I followed it for about 4 months just for fun 🤩

I’ve got 3 spring drives and Twixt was great for those since they don’t work on a timegrapher

Happily my SDs are astonishingly accurate and can take months to get out by a ~ 1 second

Arrrrgh apple only me thinks

I think Seiko doesnt regulate their Spring drive movements on their LX lineup. Its off by 0.2 seconds 😂

Yes makes sense when u think of it that way.. Thanks

Buy more and rotate more appeals to me 🤣🤣

Not sure - but yes, mine is a middle aged Iphone. One easy fix: get an old crappy iphone for next to nothing (I've got several old ones now) and use the iphone just with wifi (no plan)

If there are several apps you'd like to use it might be worth it as cost would be so small.

😂 - that might be true!

it is isn’t branded a GS, so can see them making it have a ghetto +0.1 per day average to keep you hungry for that GS diver (which insane me is hungry for )

😜

I tried on the Evo 9 diver and it was so beautiful. It wears like an MM200 on the wrist and I was surprised how small it felt for a 44mm case. That wavy dial feels very real especially considering that watch had the best AR coating I have seen, even with the single layer of sticker on top the watch appears like it has no crystal. Guess GS borrowed the super clear AR from the Astron lineup. It is definitely a great option if you want to step up from the LX.