Hello Gizmo,

Yes, this is the 18" Vac-Ro-Cut, the first Supa-Swift lawnmmower.
It would be later named the Supa-Swift Standard.
This is one of the earliest manufacturers to offer a grass catcher.

I note the highly modified fuel tank (the original being part of the engine.

I have records on these from mid 1959 to 1961.

[Linked Image]

Hope this helps.
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JACK.