Hope he got it rectified. Far more chance with a new one to have it sorted then with a 10 year old pre owned watch.
It happened to me as well a few years back. Same watch as above, 2264.50 pre owned and also 2005. The card was signed and dated by the jeweller but the space for the serial number was left blank. Model number on both cards is right. It didn't show on the web site pictures as only the top part of the card was shown in the card wallet. Only noticed it months later. The watch was found to be genuine by Omega. Next pre owned I'll ask for full pictures of the cards.
You live and learn.
Regards
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