On the SGC provided scan, does look a lot more like marker. But also with a shadow…so maybe a marker streak on the inside of the front plastic? Good news is I think your card is okay and it’s really nice.
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Trading! See my Flickr "For Trade" album (updated Dec 2023) as well as an album of my PC stuff.
https://www.flickr.com/photos/197267578@N07/albums
If you want a card, you might not get a deal. If you want a deal, you might not get a card.