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hankronA key is to look at the back. The edge around the white back is strikingly dark. This wouldn't exist on a real card. On the real T206, the back is printed directly onto the whitish card stock. The cardstock is one color all the way through, and if you cut into it, the edge won't turn to a different and substantially darker color.
Same theory applies to 1951 Bowman Mantles (and similar). Many Mantle fakes have a tell-tale white edge on the back that wouldn't exist on a real card, as the Bowman stock is dark all the way through.
It's like a hunk of baker's chocolate. No matter how you cut or chip at at it, the hunk's edges won't change color-- because the chocolate is the same color all the way through.