4) It's always tricky to grade coins from scans - flaws tend to jump out, and lustre and eye appeal fades away. I would say it's probably an American F.
5) Around the obverse: George I King of the Greeks. The "A!" after the king's name, "Georgios", is the number "1" written in
Greek numerals; the symbol that resembles an exclamation mark, is the "keraia", a special symbol which indicates that the letter preceding it is intended to be read as a number, rather than a word. The name of the coin's designer, Barre (a Frenchman), appears beneath the portrait, also in Greek lettering.
On the reverse, the denomination is written in the centre: 10 lepta. The word at the top, "diobolon", means "two obols" - the "obol" was an ancient Greek currency unit and became the semi-official Greek nickname for the 5 lepta piece and for any copper coin of similar size, such as the British halfpenny.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis