It's a Sunbeam mower. They were very good for their time. It was our first lawnmower when my folks came to Australia in 1961 and eventually got replaced by a Victa VC-160 Mk II around 1973~4ish if my memory serves me correctly.

Check out the following thread courtesy of CyberJack,

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/76641/SUNBEAM_Twin_Rotor_Electric_Mo.html

Cheers,
BB.

I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.