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Discussion Starter #1 (Edited)
While running timing trials on my new SBCM023 I decided to run a trial on my Tissot Seastar with ETA F06.111 movement. Surprised at the stability over 46 days at - 26 spy.

Nov 22 - Dec 23....Worn 50 hrs in 31 days ( 10 hpd at work ).... -26.4spy

Dec 23 - Dec 30....Worn 4 hrs in 7 days ( outside uncovered 7C ).... -25.5spy

Dec 30 - Jan 8....Worn 20 hrs in 9 days ( 2 x 10 hpd at work ).... -21.1spy

Storage temp....average 18.5C

Nov 22 - Jan 8....aggregate.... -25.9spy

Comparing this data to my SBCM023 results it looks like the ETA F06.111 is much more temperature stable than the 8F35.

I am beginning to think that a 26 spy temp stable non HEQ watch is more " accurate " than a very temp sensitive movement such as the 8F35.

Any comments, or am I looking at this wrong.

Walter
 

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While running timing trials on my new SBCM023 I decided to run a trial on my Tissot Seastar with ETA F06.111 movement. Surprised at the stability over 46 days at - 26 spy.

Nov 22 - Dec 23....Worn 50 hrs in 31 days ( 10 hpd at work ).... -26.4spy

Dec 23 - Dec 30....Worn 4 hrs in 7 days ( outside uncovered 7C ).... -25.5spy

Dec 30 - Jan 8....Worn 20 hrs in 9 days ( 2 x 10 hpd at work ).... -21.1spy

Storage temp....average 18.5C

Nov 22 - Jan 8....aggregate.... -25.9spy

Comparing this data to my SBCM023 results it looks like the ETA F06.111 is much more temperature stable than the 8F35.

I am beginning to think that a 26 spy temp stable non HEQ watch is more " accurate " than a very temp sensitive movement such as the 8F35.

Any comments, or am I looking at this wrong.

Walter
As far as I see we are talking about measurements in a very similar pattern, one where the watch is worn like 3-10% of the time and for the rest of 90-87% is at a rather constant temperature - the results are NOT relevant for the actual TC - it would have been so if we could see a result like 99% stored vs. 99% at a temperature around 30C.

I have also seen somehow similar results (in regard to temperature stability) in my 5M62 kinetic - see:

http://caranfil.org/timing/timing_data_20101226.pdf
 

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Discussion Starter #3
Looking at my data more, I see your point about similar pattern....50 hrs/31 days same as 24 hrs/16 days. Will have to increase ratio of wear time. It lost out last week because of SBCM023 getting wrist time at work.

Thanks for the look and comment.....Walter
 

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I see one of the issues with the accuracy of watches is that it is usually quoted as plus or minus. As such, the range could be very close to zero even for relatively loose spec watches (+/- 15 spm).

My mostly stored Citizen Skyhawk (non-AT) over the last month (average temp 17C) is currently showing about +2 spm. I've had that watch for about 10 years now, and until I bought my AT version last spring it was my daily wear watch at about 17 hours per day. During that time (although I didn't specifically measure the accuracy) I found the watch kept remarkably good time, correcting it perhaps once a year.


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