SH21 - Accuracy - C8 Power Reserve Chronometer

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MiniMpi
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by MiniMpi »

One thing to bear in mind is that Kip's SH21 he mentioned is an automatic and your SH21 is a handwound movement.
The automatic will keep itself wound where as the handwound movement won't.
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by would »

Yes, i know that, but please look a this post of kip:
Status of the C9 5 Day reserve test.

5 days (121 1/2 hours) and still running dial up.

I checked the timing this morning, at 108, hours and timing was at -5 seconds. Currently at -8 total for the 5 days. It would seem to be slowing down a bit as the reserve shortens.
Mine is -8 seconds/day on day 4!
C8 Power Reserve Chronometer Steel
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by Kip »

I am getting the sense that you may be overly concerned with the timing here. The noise is something else, but I am thinking that the timing may be okay. Every watch is a bit different and yours seems to be performing properly within the power range.

Here is a quote I made about the C60 Trident Pro 600 COSC almost 2 years ago.
Kip wrote:My C60-42 COSC 600 has finally stopped.

Having received near the end of March, I wound and set it then and have not adjusted the time, or wound it since. It has not been on a winder either.

I have worn this watch more than any other since arrival, about twice per week. The last time I checked the accuracy (last week) it was a total of +7 seconds. It has varied from about -4/+10 overall.

Today I picked it up after 5 days and it was stopped. It has been a good run and I have been extremely satisfied. I guess it is time to start another test.
As you can see, the watch spent most of its time within the power range over a 6 month period. Granted I think I have been extremely fortunate, but when yours is in the primary range it seems to be doing quite well. I might suggest you wear it fr a week and see how it does, if you are not already.

That said, an email to Chris may give a proper answer as to what it should be doing.
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by would »

First thanks a lot for the participation! Please don't get me wrong - it's a fantastic watch!

So last day now, and in the last 22 hours the watch lost 16 seconds! it is in the red range of the power reserve (so the fifth day).
i know it's at the end of its power, but -17,5sec/day is a little bit much for me (maybe it will get even worse, but i know at one moment it has to stop and it's ok if it slows down just before stopping) ....
my subjective feeling is that nearly every SH21 i read about was keeping time (with litte power) better til stopping than mine does... except the SH21 ones which were exchanged by CW.

I have no idea how to get in touch with chris, i don't want to be a hypochondriac ... just want to make sure...
I don't have the contact of chris, so maybe somebody could send me a pm with his email-adress. thanks a lot in advance!

P.s. can somebody confirm me that it takes a Power Reserve of 1,5 days for the SH21 to start when it is not running (totally "emty"). Mine Shows this behavior... (so i have to wound it to 1.5 days of Power until it starts to run. Thanks!

Greetings form Tyrol
Gregory
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by rhaythorne »

Hi all, I spotted this thread whilst idly browsing so thought I'd chip in with my experience of the SH21 if it helps for the sake of comparison.

I have a C9 5 Day Small Seconds Chronometer which uses the manually wound version of the SH21.

I've adopted the regime of fully winding the watch every Sunday and Thursday evenings. So each week it runs down for four days between Sunday and Thursday and then for three days between Thursday and Sunday. I wear the watch occasionally (so many watches but so little time... and wrists!) but when I'm not wearing it I have the habit of leaving it in different positions (dial up/down, crown up/down and so on.)

I last set the watch when the UK switched to British Summertime on March 26th. Checking today, 137 days later, it's running 8 seconds fast in total.

As Kip mentioned earlier, every watch is a bit different, but I've found that the trick (without becoming overly obsessed with timekeeping) is to work out in which conditions/positions a watch may gain a little and in which it may lose a little. Once you've established this, you can often keep a watch running very accurately for months until it's time to reset it for daylight savings once again.

On my SH21 I did observe that, if I let it run nearly right down (say to within the last few hours of the fifth day of reserve) it does suddenly start to run very slowly, hence my adoption of the 4-day/3-day winding regime described above.
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by nbg »

Other watch forums of interest:
TZ-UK
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by would »

Thx a lot
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by would »

I wrote Chris my thoughts on saturday...
Reporting back when i get an answer ... Probably he has a lot to do besides answering such emails...
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by smegwina »

Just to add to this.....
Timekeeping accuracy of a mechanical watch is definitely affected as the power runs down.

The IWC Big Pilot power reserve shows seven days at max power. The movement actually has a power reserve of 8.5 days, but is stopped automatically 1.5 days before the reserve runs out to preserve accuracy.

Whether the drop off should be as drastic as you are experiencing...... Not sure, but I am sure Chris will reassure you.

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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by would »

Chris just replied to my email today - perfect customer service!

He told me to send the watch back for inspection - because it should gain time near to the end of the power reserve (not slow down), and it shouldn't need a power reserve of 1,5 days to start....

I'll keep you posted...
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by Paul Drawmer »

On 13th of August we had some friends from Switzerland come to lunch..

What watch to wear? Something good, but not too flashy.

I selected the C9 5 day and set it at about 09:00 on Saturday 13th August. I use the 'Time Is' website.

I have worn this watch most days for the past month, but have not wound it on the days I didn't wear it. When it's off the wrist, I place it face up.

And here is a photo of it one month later.
Imagesh21 accuracy by Paul Drawmer, on Flickr

That's about +1 sec per day. Thank you CW that will do just fine.
There's always time for one more.
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by TG3N »

^^^^^Pretty phenomenal, really.

By my calculation, just shy of 2.6 million seconds have elapsed since it was set 30 days ago, and the watch is only out by +28 seconds during that time. Whilst that level of accuracy is not often crucial for most of us in day-to-day life, it is extremely impressive, and admirable even if just for that technical performance alone.

Just part of the reason I love these little wrist machines, that manage to perform so admirably despite being swung around, at all angles, bashed off desks etc., and subject to temperature variation.
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by Kip »

Excellent results Paul. :thumbup:

Great to see real world testing.
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by would »

Update: my C8 PR arrived at CW (after sale team) last week.
Yesterday i got an e-mail. A (probably) new watch was dispatched yesterday... Beside that i didn't get a mail. So maybe there really was a problem with my C8 PR.

I'll keep you posted.
C8 Power Reserve Chronometer Steel
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Re: SH21 - Accuracy - C8 Power Reserve Chronometer

Post by would »

Update: got my NEW watch back today. It is a new one, new serial (case and movement).
Will report back, but it started much quicker, and didn't need so many power reserve left to start. Until now very happy, and the timekeeping also seems promising.

Just have to say: the packaging has to be improved by CW. I would never send a mechanical watch in this kind of packaging. The paperbox has bumps on the edges...like the last one.
C8 Power Reserve Chronometer Steel
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