1960 Mantle PSA 9-Great price
 

http://www.ebay.com/itm/1960-Topps-M...53.m1438.l2649

Not sure but thought this card went for $30K+ plus buyer premium at a recent auction. Can't believe the common "print mark" would have a major effect on price ? Thoughts ?

Yep, likely the fisheye by his foot and the less than perfect centering drove the price down a bit. This card is not super tough to find centered, and if I could afford to pay that much for a card I would wait for a better centered example.

It is interesting to see the price fluctuation in a given grade based on quality.

Yea definitely not the best 9. A few Mantle cards do seem a little off their peak prices, but you could just as easily attribute this sale of "only" 20k to the flaws cw mentioned.