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: I bought a Aqua Terra(2503.33.00) a couple
: weeks ago. I've noticed that it loses about
: 4-5 sec/day. Is it normal? And one more
: thing, How do I know that the calibre is
: 2500B or 2500C? What's the difference?
: Thanks,
You are on the borderline for being out of the COSC spec of -4 to +6 seconds per day. Since you just bought it a couple of weeks ago, I would return it as defective if it were my watch. I'm not sure if you bought it from an authorized retailer, but they should swap it out for a replacement if you take it back and tell them it is consistently running out of COSC spec. I wouldn't keep it and "hope" it gets better, since the longer you wait the less likely your dealer will be to take the watch back. Your dealer can get full credit by returning it to Omega as defective merchandise, so they shouldn't give you a hard time.
Regarding the movement, you can see if it is caliber 2500B or 2500C with a magnifying glass if you look next to the balance wheel. See Lucretius' post further down in which I asked the same question. The movement will be stamped 2500B or 2500C. 2500C is the newer version that has a slower beat rate to correspond to the recommendations of George Daniels, the founder of the co-axial escapement. 2500B has been discontinued and all new production Aqua Terras have caliber 2500C in them.
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