Hello experts! Please help me to authenticate this SPO 8520

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Hello experts!! Can anyone help me to authenticate this watch? Many thanks in advance!
Please see the photos in my album





I just got my first seamaster planet ocean 8520, bought it from a grey market seller, I love the watch itself, but feel a bit disappointed that the chronometer certificate card was missing. My concern is that whether it will devalue an Omega watch?
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I am new to here. Any help would be appreciated!!! MTIA馃榾
 
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Omega no longer prints the chronometer cards. They stopped about a year ago. There is a COSC symbol on the pictogram card and the dial tells you it is a chronometer so the card was redundant.
 
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Omega no longer prints the chronometer cards. They stopped about a year ago. There is a COSC symbol on the pictogram card and the dial tells you it is a chronometer so the card was redundant.
Thank you so much Andy!!
 
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I might be missing something, but what album?
 
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I learned something new. Thanks!
 
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I might be missing something, but what album?
Oh, I didn't get response for the authentication, so I just deleted the link. However, I still appreciate your reply馃榾 Thank you.