Deks wrote: ↑Tue Aug 17, 2021 2:04 am I've given up trying to understand the accuracy of my CW automatic watches. They are creatures with a life of there own. One day they are within 5 secs of when set to then a day later they are 30 sec's slow as an example. I would say you need to wear them for the best way to get the best average accuracy

I used to find the same, with the watches listed above, which are the ones I wear in rotation.

I then started using winders for the automatics and keeping the hand wind watches fully wound (almost) every day (even though being SH21 they could run for days).

Doing this, the accuracy is eerily constant over many months now

^^^ I’ve always had this theory that watches perform best when they are kept running and are worn. If a watch has been sitting in a box for a long time it always seems to take a day or 2 to get back to optimal performance, and actually wearing the watch tends to eliminate the positional variations incurred by leaving it in one position even if it is wound.

It’s one reason why I have taken to wearing each of my watches for a week or more. And another justification for the idea that we probably have too many watches.

My C60 Elite 1000 is in for the 3rd time this year after starting the lose 5 mins/week. Not great for a COSC movement. Second time in, the movement wasn't fixed but the pressure gasket had failed durimg the fix and moisture was inside the watch. This was while being worn all day and taken off to sleep.
Currently wearing a 1966 1016 Explorer than didn't need winding, picked up as the time matched my mobile, and has lost 60 secs over 3 weeks.

Sorry to dredge up an old thread. I have been checking my c60 sapphire for accuracy and it seems to hover around -10s/day. Now I know its within spec but just curious as all the posts ive read seem to be plus numbers. Is it just pot luck that mine runs slow. I’m not worried , just interested to hear from you knowledgable folks.

@Southfrance As long as the rate of your watch is consistent you can set it accordingly. Set it 35s fast on Sunday and by the next Sunday it should be 35s slow. Unless you want spot-on accuracy, of course.

I started a thread on this a while ago

Amor Vincit Omnia wrote: ↑Mon Dec 04, 2023 6:55 pm @Southfrance As long as the rate of your watch is consistent you can set it accordingly. Set it 35s fast on Sunday and by the next Sunday it should be 35s slow. Unless you want spot-on accuracy, of course.

I started a thread on this a while ago

Cheers for the advice, I read the link, my eyes went a bit crossed but i get your point. As i said, not really worried about the accuracy just why minus or plus x amount per day.

@Southfrance

Like many, most of my watches run 'plus' but my C60 Anthropocene GMT runs 'minus'; about 10 sec/day like your C60 Sapphire.

Guy

Southfrance wrote: ↑Mon Dec 04, 2023 6:29 pm Sorry to dredge up an old thread. I have been checking my c60 sapphire for accuracy and it seems to hover around -10s/day. Now I know its within spec but just curious as all the posts ive read seem to be plus numbers. Is it just pot luck that mine runs slow. I’m not worried , just interested to hear from you knowledgable folks.

If you don't wear it at night try finding a position where it is less slow, or fast. e.g. try crown down, crown up etc

I love my c63 Sealander automatic. However it’s the most inaccurate watch I own. It runs at more than +10s/day, despite that being within spec it bugs me. I have other Sellita movement watches from 2xSinn, 2xHanhart & Oris which run much more accurately as do my 2xLongines & Mido with the powermatic 80.

aa_bcfc. wrote: ↑Sat Dec 09, 2023 6:54 pm I love my c63 Sealander automatic. However it’s the most inaccurate watch I own. It runs at more than +10s/day, despite that being within spec it bugs me. I have other Sellita movement watches from 2xSinn, 2xHanhart & Oris which run much more accurately as do my 2xLongines & Mido with the powermatic 80.

Have you tried
a) finding a overnight rest position that runs slower than on your wrist?
b) demagnetised it - I'd not recommend doing this without a timegrapher as it may take a few goes to get it just right.

My C63 Sealander was getting close to 12spd and like yourself I was a bit irritated by it. I bought an Etac demag tool and a Timegrapher so I could instantly see the results. The position of the watch on the Etac during demag is quite critical as is following the Etac instructions.
I now have 4-5spd which is within COSC specs.

With the timegrapher it's also easy to find a suitable overnight rest position which in my case is 7H.

rsg wrote: ↑Sat Dec 09, 2023 8:15 pmWith the timegrapher it's also easy to find a suitable overnight rest position which in my case is 1H.

Excuse my ignorance, but which position is '1H'?

clsflrn wrote: ↑Sat Dec 09, 2023 9:03 pm

rsg wrote: ↑Sat Dec 09, 2023 8:15 pmWith the timegrapher it's also easy to find a suitable overnight rest position which in my case is 1H.

Excuse my ignorance, but which position is '1H'?

Apologies it's 7H (7 o'clock up).

+/- 0 seconds after almost six weeks. At no stage during that period has it ever exceeded +2.

Neil

Anyone know a good app or method to check accuracy, I’ve been using an app called TWELVE ,but it seems a bit all over the place , with wildly varying results. I set my watch 3 days ago and tonight, after 3 days , its 1min 40s slow.

^^^^ Watch Accuracy Meter




Guy

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