Sir Ferrari: "Greek Imperial" is an older term sometimes still used to describe Roman Provincial coins; it derives from the fact that these coins almost always use Greek lettering rather than Latin. The term is not encouraged among numismatists these days precisely because of the confusion the term "Greek" generates.
TokenDave: these are indeed "Greek Imperial" coins, specifically, billon (base-silver) tetradrachms from Alexandria, and of much the same time period as the Probus one posted by DVC (late 200's AD). I can't quite make out the inscriptions to identify the emperors properly (slightly larger pics of the obverses may help). The one on the right is from an emperor that reigned for at least six years; "L S" is Egyptian-Greek shorthand for "Year 6". I believe the one on the left is dated "Year 4".
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