I wonder if this pushes the legendary Omega 1974 Marine Chronometer
off its pedestal as the most accurate wristwatch ever made? (excluding
radio receiving watches)
> Note these new movements are stated to have a +/- 15 second accuracy per YEAR.
My omega seamaster quartz, has been accurate in such extent that it has only
gained + lost + - 2 seconds during a period of 8 months. Beat that.
(Losing accuracy during summer, and gaining some during winter)
/Keo
Can I get a money-back guarantee on this claim? If so, I'll buy tomorrow.
James Rosenzweig wrote:
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"John W. Barron" <jba...@nc.rr.com> wrote in message
news:3D811853...@nc.rr.com...
If that's the only reason you are going to buy one, could you please send it
to me after you've tested it?
> I do NOT believe the 15 second a year variation claim. That rate
> is outside the limits of almost any manufacturer's ability to
> mass produce. O, sure, there are some watches made that
> will do it. I have never had one. The best I have ever had was
> a Seiko my wife gave me, years ago. I only reset it for
> the time change. But it was certainly not within 7 1/2
> seconds from time change to time change.
Breitling Super-quartz is temperature compensated, and accuracy-wise is a
totally different beast to standard quartz.
> Can I get a money-back guarantee on this claim? If so, I'll buy tomorrow.
I would imagine that if it falls outside the range they will fix it rather
than give your money back.
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> The difference being that Breitling guarantees all of these watches to
> vary by no more than +/- 15 seconds a year....whereas you have the
> fortune to have found a single sample of a watch that does that.
Yea. I must be very fortunate. Maybe Omega, by mistake, put in a
SuperQuartz inside the case by mistake. he he.
/keo
Buck
Any reason why it was discontinued?
/keo
> Omega once had something called the "Megaquartz", which was said to be
> 10 times more accurate than ordinary quartz.
not really, that watch had a strange hybid quartz/tuning fork type
movement, not the tempurature compensated dual quartz ETA movements found
in the Breitling or the Longines VIP
K Lee wrote:
--
>Note these new movements are stated to have a +/- 15 second accuracy per YEAR.
There are a few of these very accurate temperature compensated quartz
movements, for example:
- Breitling SuperQuartz
- Rolex Oysterquartz
- Omega Seamaster Pro
- Omega Marine Chrono
- Krieger Marine Chrono
- Longines VHP
- Pulsar PSR-10 (Seiko)
AFAIK all of the above are temperature compensated (either digital or
analog compensation). Most likely all use "aged" crystal (or two in
digitally compensated watches).
I believe all of the above meet the stanbdards set for
(mehcnaical!!!!) marine chronometers, and are rated either +/- 10 or
+/- 15 sec/year (except Rolex which doesn't publish a rating) in
normal use and can be much better in certain conditions.
BR,
Jarmo
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Japi wrote:
--
Could you please explain "aged", "digital compensation", "analog
compensation" and why digital needs two crystals. TIA.
>> AFAIK all of the above are temperature compensated
>> (either digital or analog compensation). Most likely all
>> use "aged" crystal (or two in digitally compensated watches).
>
>Could you please explain "aged", "digital compensation", "analog
>compensation" and why digital needs two crystals. TIA.
The quartz crystal oscillation rate can change a tad in the beginning
of its life. For uses requiring high accuracy the crystals are
artificially aged by keeping them in alternating-temperature condition
for a few weeks or months.
Analog compensation has a termistor that varies the quartz oscillation
rate, counter-compensating for the changes that naturally occur with
temperature. A digital compensation system has 2 quartz oscillators of
widely different frequency, the high frequency one detects the drift
of the low frequency main crystal.
My original post was actually intended as a follow-up post to "New
Breitling SuperQuartz Movement" but I seemed to have managed a new
thread.
--
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"John W. Barron" <jba...@nc.rr.com> wrote in message
news:3D836E46...@nc.rr.com...
>At one time I owned a Rolex Oyster Quartz. It did not keep time to 15 seconds a
>year, and for most of the time I owned it it was more like 15 seconds a week. It
>was disgusting, considering how much I cost. I traded it in on my Explorer II.
Did you try having it adjusted? Oyster Quartz is one of the few where
the rate can be adjusted quite easily.
I quite like the Rolex movement, unlike most quartz movements it can
be repaired and adjusted. I had one for a while and it was well under
the 15s/a limit. However, I have to admit that mine got very little
wrist time because I didn't care for the looks.
Of all of these temp compensated watches I've seen (and owned) I like
the "lowly" Pulsar PSR-10 the most.
> Any pics John ?
> I would be interested to see it or one like it. I have a Omega SM f300
> and I had that serviced about a year ago and since then it has gained 3
> seconds. Not bad for such an old watch. I bought it off eBay for a £100
> and it cost me £70 to have it serviced. It too is large & bulky. Cant
> stand weedy watches personally.
>
yes, there are a couple on this page
Do you have the watch price annual - you know the one I mean (Cooksey Shugart)?
I first learned about the watch there. The Omega claim "the most accurate watch
in the world" struck me so, that I had to have one. Almost as soon as it
arrived, I dropped it (yes, I know - stupid). I sent it back to Omega in Switz.
and had it rebuilt. The picutre is in the 2001 edition of Cooksey on page 947,
bottom of left hand column.
I am still looking for the watch shown above it "Chronoquartz". Haven't had
much luck finding it either. Oh well, got to keep looking, I guess.
more info from the Omega museum
>
> There are a few of these very accurate temperature compensated quartz
> movements, for example:
>
> - Breitling SuperQuartz
> - Rolex Oysterquartz
> - Omega Seamaster Pro
> - Omega Marine Chrono
> - Krieger Marine Chrono
> - Longines VHP
> - Pulsar PSR-10 (Seiko)
>
> (snip)
According to other internet source (not omega), the Omega seamaster
quartz isn´t temperature compensated.
Nevertheless, my seamaster has been under very hot sun heat, for several hours and
then right after cooled down very rapidly under water. (probably a temperature
difference from 40-45 degrees C to 10-15 degrees C)
Also, my smp has been tested with the "heating-up-watch" + "cooled down with ice"
for checking for moisture inside watch.
Still, it hasn´t been affected by the rapid temperature variations.
/Keo
While it's true no Bulova accutron was ever COSC certified as a chronometer
every Accutron shipped exceeded COSC specs out of the box. There was
really no point in certifiying them; these were $100 watches that
were far more accurate than COSC counterparts costing 4X as much.
The Omega movement was indeed much MORE accurate, but you can't get
parts for them these days (modulo buying another one to
cannibalize for parts).
--
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>According to other internet source (not omega), the Omega seamaster
>quartz isn´t temperature compensated.
I don't have any info either but was under the impression that
Speedmaster Pro X-33 is temperature compensated. The rating (+/-37
s/a) would sort of point to this direction. I wonder if anybody has
the definite answer on this.
And just to be complete: Another apparently temperature compensated
watch is Seiko Prospex perpetual calendar (Japan only?). Again, never
seen this but had some discussions with an owner who assured that
temperature compensation is confirmed in the watch manual.
--
K Le wrote:
> Japi wrote:
>
> >
> > There are a few of these very accurate temperature compensated quartz
> > movements, for example:
> >
> > - Breitling SuperQuartz
> > - Rolex Oysterquartz
> > - Omega Seamaster Pro
> > - Omega Marine Chrono
> > - Krieger Marine Chrono
> > - Longines VHP
> > - Pulsar PSR-10 (Seiko)
> >
> > (snip)
> Will any of these companies sell their watch on a money back guarantee of 15 seconds
> per year? If so, I want one. I have a Longines VHP and it doesn't do it. I have
> already written about my Rolex Oyster Quartz did not do +- 15 seconds a week, much
> less per year. So there is the challenge for any good watch firm that want to make a
> sale. Guarantee what you claim, and I will buy.
I don't think rapid temperature change affects quartz accuracy. Temperature
compensation is designed to avoid the tiny but noticeable discrepancy
between winter speed and summer speed. For instance, my
non-temperature-compensated quartz loses a second every 10 days in winter
and gains a second every 10 days in summer - if it was temp-comp it would be
hopefully spot on all year around.
I've never heard that. But Bulovas ads state it was good to 1 (2?)
secodns a day, and they'd replace yours if it wouldn't. That's
better then COSC specs.
>
> I don't think rapid temperature change affects quartz accuracy. Temperature
> compensation is designed to avoid the tiny but noticeable discrepancy
> between winter speed and summer speed. For instance, my
> non-temperature-compensated quartz loses a second every 10 days in winter
> and gains a second every 10 days in summer - if it was temp-comp it would be
> hopefully spot on all year around.
>
>
Hm.. then it explains why no immediate changes are manifested during
these
accelerated temperature changes.
/keo
>
> I don't think rapid temperature change affects quartz accuracy.
> Temperature compensation is designed to avoid the tiny but noticeable
the difference between room temperature and body temperature is 0.10 to
0.15 seconds per day, even cheap non-adjustable quartz watch are adjusted
at the factory to be 0.15-0.20 seconds per day fast, when worn the quartz
will lose 0.10 to 0.15 seconds per day