Its not a Simpson.
Its a Hoover Dryer from the 70's to early 80's. After this style came the Hoover Apollo models that consisted in one form or another until Hoover disappeared. As far as I'm aware, all of the Hoovers were made by Hoover in Sydney, under license and then as the model evolved as a unique Hoover design.
Its design came from F&P in New Zealand, they were sold as F&P's and Kelvinators here in that form factor until the early 1990's. These ones were made in NZ.
Cheers
Nathan