I'll have to find a mechanical one of these days, nothing like them.
Could not find any data on the intriguing Aussie innovation of logic chips in Pokie except this:

Key Dates:
1933:
Ainsworth Consolidated Industries is founded in Sydney, Australia.
1953:
Leonard Ainsworth takes over his father's company and converts production to slot machines.
1956:
Slot machines are legalized in New South Wales and Ainsworth launches its first model, "The Clubman."
1960:
Company opens an office in Europe.
1961:
Company opens a new production site in Sydney; also launches the Aristocrat Nevada machine.
1964:
Company enters the Nevada market through a U.S.-based sales agent.
1965:
Company releases the first poker machine featuring electronic components

So it was 1965. Is there an index of EA articles for 1965?

This probably your best bet:

http://www.hrsa.asn.au/h_magazine.htm#A4.

Ainsworth was one of the big three machine builders here. Olympic and Aristocrat were the other two. I'm not sure who is making them these days.

Years ago before poker machines were allowed in NSW pubs we had a variant known as a card machine, or 'cardies' as they were known. They dealt basic five card draw poker and the player could throw his bad cards in exchange for the same number of hopefully better cards. If the player won he could gamble his winnings up to five times or just take the credits owing. At the time 'pokies' where only permitted in registered clubs.

The same manufacturers built both types of machines.

I tried building a Poker machine in the mid 60s with no money or workshop as I had an obsession with them (as you can tell). Real Pokies were far away to see, 55mi to Tweed Heads, so couldn't even study actual ones. It used uniselectors from a surplus store and 3 rows of 5 lights. I told older friend about project as he wanted to own one as he actually visited the NSW clubs. When he saw the project he declared it inauthentic (no sale). In 1990 while unemployed I built one that combined pinball & 3 reel slot (was still obsessed). See Special Projects forum for picture.