Hi Jamie
Here are the two Mantle cards from my master 1952 TOPPS set. When you compare the front's, you will notice minor differences.
The most notable difference is the glossy glare on Mickey's right arm (Type 2) vs. the clear skin tone (Type 1).
Type 1 .................................................. .........……...........
Type 2
And, as already stated the stitches on the BB on the back are reversed between Type 1 vs. Type 2 cards.
Good luck.
TED Z
T206 Reference
.