If this is the card.....
http://cgi.ebay.com/MICKEY-MANTLE-19...-/220743227135
Its a reprint, and an easy one to spot if you look at the right spots.... take 1/2 second to tell.
The first thing that jumps out is the whole image is washed out looking (light) when compared to the black line around the image.
....best place to look is at the bottom border where the "R" on Mickey uniform touches the black line. Authentic cards the "R" and line are basically the same exact color.
authentic card (google image)