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