@tsshv125, first welcome to CCF. Second, looks like your thread was moved to the right spot, so you'll know for next time. I don't see anything out of the ordinary with the '91-D mintmark, but a close-up of this area might help us to see the same thing that you are with the coin in hand.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz