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Posted By: davidcycleback

I answered a very similar 52 Mantle question on my Q & A column about two weeks ago. It's about four or five questions down:

http://www.cycleback.com/qanda.html

The Mays is smaller but made smaller size.

The key is that both cards are on darker old-timey cardboard stock, and the front white borders are 'whitewashed' and have a different consistency then the back. If you look at the edge (thickness of the cards) they should be cardboard teture/color just like the back. The backs are matte and never glossy.

In the end, if you are unsure, you don't have to buy the cards and could get them somewhere else graded by PSA or SGC.