Mike - I submitted it as a crossover from an SGC slab that identified it as a 1954 A.S. Photo Pack, of course it was an SGC 4 and PSA downgraded it to a 3.5
I thought PSA kept the flips for crossovers to send back to the other grading companies but i guess the onus is on the collector now.
Chris - Yea i would love to hear why the 51 self promo card isn't recognized since it is clearly documented. Maybe since Mantle probably issued it himself? I wonder if there are any other self promotion items graded by tpg...