Interesting question. I know little about watches but, as you would know, your watch does have a quartz movement, so, from Wikipedia, 'Quartz clock': Standard-quality resonators of this type are warranted to have a long-term accuracy of about 6 parts per million at 31 degrees C (87.8 F): that is, a typical quartz wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5 deg C / 41 F to 35 deg C / 95 F) or less than a half second clock drift per day when worn near the body. If a quartz wristwatch is "rated" by measuring its timekeeping characteristics against an atomic clock's time broadcast, to determine how much time the watch gains or loses per day, and adjustments are made to the circuitry to "regulate" the timekeeping, then the corrected time will easily be accurate within 10 seconds per year. This is more than adequate to perform celestial navigation. Assuming that you have a computer with internet-synced time and good internet, meaning around 1/100 second accuracy, why not compare the watch to the computer over the space of a week?
Your suggestion is exactly what I've done. I suspected it of losing about 5 minutes in the past month and that disturbed me as I felt it should my much more accurate than that. So, I set it today to the Master Clock at the Naval Observatory here in DC. I will check it weekly to see if there are any changes in the relative time indicated. If so, it is still under warranty, but without a stated specification as to the accuracy, Movado may or may not make necessary adjustments under the warranty.
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SOURCE: just bought this watch today (movado 800 series)
I wouldnt try to return it. I would go back and inform the store of the problem you have and they have no choice but to either fix it, show you how to solve the problem, exchange it, or at the least, return it but please give them a chance to fix the issue.
Best wishes,
SOURCE: I just recieved my Movado
you do not need to return, as this is re-settable. Pull out crown to the first position (date setting) and then toggle with upper push button. If upper button do not do the job, try the bottom one. When you reach 12, then push the crown back in. Start the chrono, stop it and check if it returns to 12.
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