I remember the 'mericans switching over to STD in the early '60s. And as I recall, the last Australian manual exchange to cut over to STD was in 1991.It's not so much the start date, but the end date that's important. I met a Merkin (several actually) when the USS Enterprise was in Hobart in the mid 70s. One told me that his folks were reliant on an earth return phone line via a pyramid switchboard. When there was drought there was no telephone service.
When we cut over surrounding exchanges to Smithton in NW Tasmania ca. 1972 I was told it was the last of the manual exchange cut overs. Perhaps I was misinformed and happy to stand corrected.