1895 Mayos Cut Plug

SweetPickle

How can one tell if these cards are reprints & do they all have black backs to them?I recently purchased a couple from an auction house & I received them today & now I'am questioning there authenticity.Would it help if I attached some pics so you guys could see them?Thanks for any help you might have,Chris!

ping4u43

Pictures would help. Most of the Mayo's are not in the greatest of condition. Soft and rounded corners on most I have seen or owned.