This coin has two heavy scratches right of the figure. The line at the far left is a flan flaw rather than a scratch. VF Test cut Athens Owl rx. This coin was severely cut to see if it was solid silver. Countermarks frequently leave a flat spot on the opposite side of the coin.
Dealers frequently state a separate grade for a countermark applied to a more worn coin.
Although quite illegal, the practice was common enough that many coins are found missing all or part of the legends. Obviously this reduces the value of the coin to collectors. F Ex Jewelry Theodosius II Roma rx. Many gold coins were once used in jewelry and show marks from the removal of the mount. These are by no means all of the factors to consider when grading ancient coins.