As promised following are some photos from the 80s brochures.
First as the SARONIC SUN. Back in 1982, she used to sail from Piraeus (Flisvos) to Spetses or alternative to Mykonos-Delos.
I think that a shorter run from Lavrio to Mykonos was tried at first.
mistral1.jpg
Then as the MISTRAL II against the cliffs of Santorini.
mistral 1.jpg