Looking for the 1957 copy of "The Shiralee" with Peter Finch, I could only find trailers on the Australian Screen website. However, I found another Australian movie set in the late 1960s: December Boys.
It's a coming-of-age picture about four close-knit orphans in Australia, called the December Boys because they were all born in the same month. They leave their orphanage for a Christmas holiday at the seaside settlement of Captain's Folly, staying with the eccentric Mr and Mrs McAnsh, who are partial to pumpkin wine. Wearing bathing costumes made from flour bags dyed black, the boys meet the ocean for the first time and are soon racing through the sandhills to plunge into the surf.
December Boys is a classic tale of an unforgettable summer beside the Pacific Ocean. The book by Michael Noonan was first published in 1963 and was recommended for the Miles Franklin Award.
I won't tell you anything more because you can do as I've done: go to ebay.com.au and order your own copy.