Dear Forum: I have a new Omega Seamaster Aquaterra quartz which has a 1538 calibre. Is this the same movement as my '95 Seamaster? It seems to have the identical features. Thanks, Roger. P.S. why does the second hand never line up with the indices? I assume 'low qualtiy control' is the answer!
Omega 1538 calibre
RogerE
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Forgive me, I'm new here.
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No problem. I was only trying to suggest other fora for you to get more information.
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Are the Omega 1538 calibre movements COSC certified? Are any of Omega's quartz movements , for that matter?
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Almost all of the early ones were COSC certified. None of the recent ones have been.
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Any particular reason as to why they stopped certifying them?
They wouldn't pass the new COSC rules for quartz that date back to 2001 : https://www.watchuseek.com/f9/question-heq-scholars-cosc-40583.html
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The Cal 1680 based Constellation Double Eagle would have passed. Indeed, Omega has used a number of thermolines in the past all of which would have passed. I suspect they just saw no marketing motivation in adding Chronometer to the dial.
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Omega used only one Thermoline (Cal.1680 = ETA 252.511). The earlier thermocompensated movements in the Omega watches (Cal. 1441 = ETA 255.561 and Cal.1445 = 255.572) could not be Thermolines as they were no longer available in 2001 when ETA introduced its Thermoline Family of thermocompensated movements.
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So would the Cal.1680 (ETA 252.511) based earlier model, the Constellation Perpetual Calendar.
Which is a bit strange since they reinstated a TC movement after dropping the 1441 for the 1438 on the Seamaster 200m, would love to know the "story" on why that happened at the time...
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My 2 pre-Bond quartz models-one a 1441 and the other 1438 - are seconds hand accurate. But my two Omega X-33s show one accurate and the other off the markers. My late 1980s Polaris quartz is accurate....
So it is, for sure, rather hit and miss, not just with Omega but many other quartz brands.
So it is, for sure, rather hit and miss, not just with Omega but many other quartz brands.
The Double Eagle Perpetual Calendar could pass COSC, but then again - that model is no longer in production from 2010 :-(
Yes, found that out at a dealer the other day, wonder why they removed that rare bird from their catalogue, I guess it wasn't selling well enough, strange since their can't be too many perpetual calendars around. Maybe a chronometer cert would have helped.
As for my comment, it was referring specifically to the 1538 movement, the topic of this thread ;-)
As for my comment, it was referring specifically to the 1538 movement, the topic of this thread ;-)
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