In handwriting there is a difference between European and American. In Europe we don't really have problem with 1 vs 7 or g vs 9. But our nines and ones do look like gs and sevens to Americans.
I heard an American making a joke that
"I have gg problems but European handwriting ain't 7 of them."
I heard an American making a joke that
"I have gg problems but European handwriting ain't 7 of them."