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Damian...you do as the above posts suggest. Just look at completed ebay auctions for similar or close items and get a percentage above SMR for that card. Doing this is pretty accurate for current market value. Pretty much you can take the days in the 80's when Beckett was the "bible" and forget it. Guides now are only truly guides and even then are blind at times. Undervalue for vintage and way overvalue for modern (glossy, pretty sh!t).
Damian
Damian