I am starting this new thread about Antikythira as there has been renewed interest in the last 50 years...
When I was growing up in the 1950s and 1960s, Antikythira was sparsely populated. I do not recall any "regular" ship stopping there. For example, I do not recall the east Peloponissos subsidized route to east Lakonia and Kythira including also Antikythira (I am sure that Ellinis will check all this). But in the late 1970s there were the first efforts with a run going to Kythira, Antikythira and then Kastelli...
Here is a nice photo of Potamos, the main port, from around 1990
Potamos Antokythiron.jpg
Antikythira with the unfortunate Ionion at the pier, in the late 1980s
Antikythira2.jpg
Antikythira The main Potamos pier (1989)
Antikythira.jpg