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.
Hope this helps. ------------------------------ JACK.