@FC, I agree with the others that it is hard to tell from the pics. However, in hand, you should be able to determine this yourself. If the linear mark is incuse (below the surface of the coin) then you have a scratch. If the linear mark is in relief (raised above the surface of the coin) then you may have a die crack.
In the end, it is pretty minor regardless of what it is and likely doesn't add to or detract from the overall value of your coin.
"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