Back in 2015, I shared a 1966 newspaper clipping on the Lady Class Ferries that were due to enter into service by the end of 1967.
On September 19 1968, the first of six Lady Class Ferries - Lady Cutler, entered service. It was named after the wife of the current NSW Governor, Sir Roden Cutler who was there in person to see her namesake.. Another five ferries would enter service over the next decade. Lady Northcott and Lady Herron still operate today.
Source: Anonymous. 1968. "New Lady Takes Harbour". The Daily Telegraph, September 20, 3.
The ferry operated until 1991. In 1998, it sailed down to Melbourne. After refurbishment works, it returned to service in 2007 as the Lady Cutler Melbourne Showboat and does chartered cruises along the Yarra River and Port Phillip Bay. .