@mita, first welcome to CCF. Second, your dime has mechanical damage, which has caused the reeding to get worn away and flattened. This might be a so-called Dryer Coin as noted by @keith.
"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