Hello BriggsHandy

Yep, I know that page ...
there are a number of technical and factual errors there.
It is an old webpage, but with some good stuff.

The Amplion there is a 'toecutter' base and not similar at all.
It does use the same engine though. Hurricane engines were used on
a number of 1950s and '60s lawnmower makes.

Atco is ruled out. They are reasonably well documented at this time.
Having a Hurricane engines means this lawnmower originated in Australia.

Your machine has quite a deep steel pressing, suggesting a 1960s mower
(rather than 1950s). That it has a single point height adjustment is significant,
as is its unusual central front location.

I think we need to see the close-ups of the wheels, tank, handle, etc.
The best lead is your logo photo. It defines a very specific winged shape.

Thanks for helping us in this mystery.
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JACK