It's Servis not service - this matters because if you spell it wrong, you won't get a match when you search.
It's the 1980s Simpsons I was referring to - the large capacity models appear to based on a Maytag, though the transmission is Simpson's own design. The basket mount and agitator shaft look the same as the Maytag bits in your photos above. I have no proof but I believe that Simpson must have had a Maytag out the back when they designed the 144 series.
I'm not recommending these machines, in fact I don't really like them, but if that is what you like, you need to look patiently for a long time and they do turn up occasionally.
If you like the large simple American-style washing machines, the Australian-made Hoover 500, 600 or 700 series were great washing machines, in my opinion better than a Simpson, Maytag or Wilkins Servis. They were based on a US Blackstone washing machine, but became more unique to Australia with every model revision. They wash really well, are very durable and are out there still in SMALL numbers. The old belt-drive Whirlpools were made here too, are very long-lived and still show up on Gumtree from time to time. Collectible washing machines aren't on Gumtree every week, and when they do show up they may be frustratingly far away from you, but keep waiting and looking, they are still out there but you have to be patient and diligent.
here's a Whirlpool:
https://www.gumtree.com.au/s-ad/raz...utomatic-whirlpool-washing-machine/1257896796
Here's a Hoover 720:
https://www.gumtree.com.au/s-ad/sun...hoover-washing-machine-model-a6092/1291628598
The Hoover 720 is in Suburban Melbourne, looks in good nick, possible rusty drum near agitator?(see photos) but if I were you I'd run and grab this washer. The rust looks only superficial and could be repaired with advice from others on this website. Run run run and get this washer....