[Buythatcard]

I have come across many cards from this set and they all looked like the real deal to me. Until today. I came across a Mantle card that just did not look right. Usually the back of a 57 has the flat look. But the back of this card actually has a slight glossy look.
I have never seen a 57 reprint and I am hoping someone out there can shed some light on this card. I included the scan but I am not sure whether that will be enough to determine if its a reprint or not.

I did not buy this card. I was planning on selling it for someone else.

Any help would be appreciated.