Seiko 6309 Accuracy - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Old 02-21-2018, 11:30 AM   #1 (permalink)
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Default Seiko 6309 Accuracy

What kind of accuracy should I expect out of a cleaned Seiko 6309 movement? Dial up and down and amplitude.
Thanks for sharing.
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Old 02-21-2018, 11:49 AM   #2 (permalink)
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depends on a lot of factors. Was the spring changed too? Time keeping depends a lot on how it was regulated. What kind of numbers are you getting?
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Old 02-21-2018, 07:31 PM   #3 (permalink)
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Default Seiko 6309 Accuracy

I replaced the mainspring. Dial up + 10-15 seconds and dial down -5-10 seconds. Customer claims it's gaining + 20-30 seconds a day. The information I can find a + 10-15 seconds is a good rate?
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Old 02-22-2018, 10:23 PM   #4 (permalink)
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I'd say 230 to 250 is very good and anything above that is excellent. Rate wise isn't the spec +-25 spd?

I'd imagine if you can get the watch running perfectly in dial up and down, you can adjust to synchronise the vertical positions to get a lot more accurate.

I'm struggling with a 6306 as I write this...240 to 250 amp but irregular rate in horizontal...

You've posted this thread in the How to section, so it probably isn't very visible.
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Old 02-22-2018, 11:09 PM   #5 (permalink)
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Does your customer truly expect better? Sure some can be serviced to better daily rates but most examples are +/- 20 spd on the wrist. It's an old watch !

I would try to reset the customer's expectations of what vintage timepiece ownership is all about.
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Old 02-23-2018, 12:59 PM   #6 (permalink)
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Thank you.
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Old 02-23-2018, 01:17 PM   #7 (permalink)
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After service my watchmaker said that my 6309 has about +-20 secs positional error. When other numbers are OK, this can be adjusted to about +-3 to 5 secs per day, if the person who wears the watch has similar activities every day.

I wasn't satisfied with that accuracy, so I said to my watchmaker to inspect everything.... ....he found that the pallet fork could be better. Luckily, you can find almost everything NOS for 6309...

With new pallet fork, my 6309 had positional error of 12 seconds in 6 positions. After run-in and adjustment it runs at 0 to max 3 secs, no matter if I wear it 6 hours and leave it 18 or I wear it 24 hours per day.

Old Seikos have around +-10 secs positional error if everything is OK. But it tends to get worse with worn parts.
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Old 02-23-2018, 01:19 PM   #8 (permalink)
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Can you remember the amplitude figures Hvorje?
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Old 02-23-2018, 01:35 PM   #9 (permalink)
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Quote:
Originally Posted by hhmischko View Post

Old Seikos have around +-10 secs positional error if everything is OK. But it tends to get worse with worn parts.
My old (probably unserviced) 6309 sports diver was one of the best timekeepers i have ever had. It ran steady within 5 seconds a day without much positional difference by the looks of it.
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Old 02-23-2018, 01:35 PM   #10 (permalink)
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Guy, as I can remember...

We didn't even bother to check the amplitude before service, positional error was over 2 minutes....

After service, amplitude wasn't great but not to bad. It dropped 24 hrs after full-wound to 190-ish in vertical positions, and over 220 in horizontal.

According to some on-line specs this is acceptable, but I didn't want to have a watch with +-20 pos. err, since my Ruskies have less.

After pallet fork change he just stated - much better amplitude.

If it helps...

Re. your 6306 probs, even with my worn-out movement AND before service, beat error was OK, and it run fine in single position.


Quote:
Originally Posted by koekoek View Post
My old (probably unserviced) 6309 sports diver was one of the best timekeepers i have ever had. It ran steady within 5 seconds a day without much positional difference by the looks of it.
I would be interested to hear what the timegrapher has to say....

Last edited by hhmischko; 02-23-2018 at 01:39 PM.
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Old 02-23-2018, 01:45 PM   #11 (permalink)
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Cool thank you. And we need a pic of this 6309!

Next for me is to replace escape and then I may aswell put a new pallet in if that doesn't change things.
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Old 02-23-2018, 01:49 PM   #12 (permalink)
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EDIT: vertical lines are noise of changing position.


Thid DEG readings on this PC software are very different than readings on my watchmaker's Witschi... Don't mind...



Well, my watchmaker says if it is to irregular in one position the cause is hair-spring, balance or lubrication....

Last edited by hhmischko; 02-23-2018 at 02:01 PM.
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Old 08-24-2018, 10:21 AM   #13 (permalink)
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Some customer expectations are too high. These are 50-60 year old watches. You don’t expect a person of that age to sct like they were 20 do you?
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Old 08-24-2018, 02:00 PM   #14 (permalink)
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Really impressed with mine. Keeps better time than all my other Seikos. +/- 2 secs per day. Phenomenal for a 37 year old beater.
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