Omega Seamaster Watch Serial Number Change?

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hi everyone. 1st post here. I just purchased a new omega seamaster professional from an AD. The serial number on the back starts with an “A00....” so it is 7 digits but starts with a letter instead of a number. I spoke to the dealer and he said that Omega ran out of serial numbers and had to switch to lettering - like Rolex did some years ago. I am nervous I have a fake and wanted to see if anyone here could corroborate or knows anything about this change. I called omega and brought it into the boutique - they can’t find this in their database for service and they did not know about this change in serial numbers. Please help!
 
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Post a photo of the watch
 
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Not likely to be a fake from an AD. Also not likely that Omega "ran out of numbers." Rolex switched to letters in 1987 for reasons known only to them--they were at 10 million, so had lots of numbers left. Interestingly, the first 4 letters Rolex used were R, L, E, X. Pretty obvious why they didn't use "O." I'm wondering if the A00 might be some limited edition number rather than a serial. As mentioned, a photo would be helpful.
 
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Serial number is on the underside of a lug. I tried to do a couple blowups of it, but they're too fuzzy. Is this the A00xxx you're referring to? Is it possible you could get a better-focused picture of it?

 
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I just purchased a new omega seamaster professional from an AD.
You got a warranty card with the watch then? Is the number on the card the same as on the watch?
 
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Sorry newbie here. Is it safe to post serial number online? Whenever I see them for sale online they block them out.

A00.... is stamped on lug, stamped on movement as well as international warranty card. Concern is that no one seems to recognize this sequence as Omega serial numbers are all numbers not beginning with letters.
 
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I think blurring serial numbers is silly, but if you could post a clear photo of the serial (on the warranty card perhaps) with the last 2-3 digits blurred, that might help someone like @Archer to look it up in the Omega database.
 
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pm Archer with the full serial if you are concerned. Omega serials are currently at around ~99m so it is quite possible they have gone to a Axxxxxxx format rather than going to a 9th digit. The fact it is the same is in all 3 places makes me wonder if this is what has occurred. Or it could be a Carnet watch which wouldn’t be good, but I think it more likely it’s a new code scheme, they were running out of 8 digit numbers after all. If it’s A0000001 it could be rather special!
Edited:
 
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My inner geek maybe wishes they had gone over to full hexidecimal. 100,000,000 would be a rather easier 5F5E100