Ancient Coins

In order the larger pictures were posted:

#1: Roman Empire, Gallienus antoninianus, as others have said. There's not enough space left for "VICTORIA" to fit on the reverse lettering; I think it's PAX AVG. Antoninianii of this period were made of extremely debased silver - less than 5%.

#2: I have no idea. It looks a bit too small to be a Kushan copper, and appears to have a human figure on one side and an eagle on the other.

#3: Roman Provincial, I think I can make out a large "SC" inside a wreath on the reverse. That's a very common design for coppers of Antioch. Being counterstamped like this one also seems to be a common fate for Antioch coppers.

#4: Appears to be Late Roman, from what I can see of the portrait, but the seated figure on the reverse looks earlier than that. I can't read enough of the lettering to be able to tell whether it's a Greek or Latin legend on the obverse. It looks copper but there's no way to know for sure unless we can actually ID the coin.

#5: It looks more Islamic/Indian, rather than ancient. It appears to be bronze/copper.