First, the “2011” on your warranty card isn’t a date, it’s the Omega internal code for the United States. All it means is that the watch was sold to a dealer in the US.
Second, as Tom also said, you can’t use those serial number charts to judge when modern movements were made. They are an extrapolation at best. If you bought your Planet Ocean in 2013, it likely did not sit on the shelf for more than a year or so. If it’s worked fine since then, and has been serviced (as it probably should for a 7-year old watch), does it really matter when it was produced?
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