Given the long history of Greece, and the long history (contrary to public perception) of red brick construction, this fragment of brick could be 1 week old or 2800 years old (or whenever the Greek alphabet came into use). I'm assuming this brick isn't too old, since the lettering isn't really worn off of it too badly, but on the other hand, if it's so new how did it get onto the beach? It's an interesting mystery anyway.