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Old 18 May 2020, 12:33 PM   #1
larryccf
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How long before you guys consider a Seiko

broken in? ie, for starting to watch the time accuracy in terms of seonds per day

My new Sumo, with a 6R15, has been running for 3 or 4 days now at 10 seconds + per day, but i don't want to regulate it and find myself chasing a constantly shifting target.
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Old 18 May 2020, 08:28 PM   #2
1William
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That is pretty good timing but not COSC, of course. I would set the watch and wear for five or six days without checking the timing and resetting it. Depending on when and how you are wearing and resetting the watch you may not be getting a true reading on the time. At the end of that time see where you are. Might be better than what you are getting now.
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Old 18 May 2020, 09:45 PM   #3
77T
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As for the movement reaching its peak performance, I’d give it a few months before checking it for a potential regulation.

That should give the staff time to settle as well as the going train to mesh consistently without undue friction.

Then restart your observations daily and aggregate a moth of data without resetting it. That is your new average accuracy.

Don’t just do a day here and a day there.


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Old 18 May 2020, 09:52 PM   #4
77T
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Quote:
Originally Posted by 1William View Post
That is pretty good timing but not COSC, of course. I would set the watch and wear for five or six days without checking the timing and resetting it. Depending on when and how you are wearing and resetting the watch you may not be getting a true reading on the time. At the end of that time see where you are. Might be better than what you are getting now.


I agree it’s not COSC - but Seiko only claims an accuracy rating of -15/+25 seconds per day for the base movement.

Also agree long term observation without resetting is best method.


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Old 18 May 2020, 11:01 PM   #5
larryccf
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Thanks - i was guessing 4-6 weeks but i'll let it go a couple months.

I misspoke earlier, it's now at 12 seconds over 4.5 days, which isn't bad, but what's probably representative of the fact it's still breaking in, the 10 seconds + showed up in the first day or so of operating.
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Old 19 May 2020, 10:47 AM   #6
toxicavenger
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I honestly don't care until I notice the time is minutes off a day.
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Old 25 May 2020, 12:57 PM   #7
toptier
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Doesn't really bother me at all as long as it's within the stated specs.
I have too many Seikos than my fingers and other watch brands that I barely notice the time variance since they only get used for one day each
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Old 25 May 2020, 02:58 PM   #8
larryccf
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At the 17 day mark, my 2017 SUMO (new) showed just under 2 spd averaged over the 17 day window.

I reset it the other day, and 1.5 days later it's less than 1 to 1.5 seconds fast. I was about to pull the trigger on a SLA025 with the 8L55 movement but held back - worried it wouldn't show me the accuracy this SUMO is, and i'd be pissed.

Think i'm going to refocus my interest on a SLA033 for a couple of reasons 1) case is a lot shorter than the 15.7mm height of the SLA025, so wearing comfort will be enhanced and 2) the caseback is removeable on the SLA033 so if i need to regulate the 8L35, it'll be a simpler chore.

But i've definitely fallen into the Seiko rabbit hole - just pulled the trigger on a 2019 Green Sumo with the 6R35 mvmt - curious to see what different the shorter case height means, and the looks of the sapphire crystal
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Old 25 May 2020, 03:26 PM   #9
DCheeta
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I honestly don't care until I notice the time is minutes off a day.
Me too. This is one of those things that has never even entered my mind, unless, like you said, it’s off by minutes.
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Old 25 May 2020, 05:57 PM   #10
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Me too. This is one of those things that has never even entered my mind, unless, like you said, it’s off by minutes.
Same here. I dont even set time to the exact second. I usually want to be about a minute ahead.
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Old 26 May 2020, 02:48 AM   #11
larryccf
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IF knowing how accurate your timepiece is doesn't interest you, why not just wear a sundial?
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Old 27 May 2020, 05:13 AM   #12
toxicavenger
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IF knowing how accurate your timepiece is doesn't interest you, why not just wear a sundial?
If it is within spec there is no concern for me.
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Old 27 May 2020, 05:18 AM   #13
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My 009 is shockingly accurate and has an aligned chapter ring. I’m not usually that lucky.


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Old 27 May 2020, 11:49 AM   #14
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IF knowing how accurate your timepiece is doesn't interest you, why not just wear a sundial?
If I need precision, I would opt for quartz. But in my opinion, a quartz watch doesn't have a soul like a mechanical watch. But I do have some Swiss timepieces that achieve about minus 1 second a day, which is phenomenal for a mechanical watch.
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