Ahh, these things. They were a fairly short-lived mid 1970's-on direct import by Deckson; CyberJack has correctly identified the US source.
Deckson sold them as their entry level 'Mowette' [note local spelling] model.
They were not a great success in our dealership area [Cobram, Vic] at the time; the lack of a floating cutter deck, and cutting height adjustment, was a distinct disadvantage.
The solid tyre wheels didn't help it, either.
IIRC we only ever stocked one of these, and it became a 'sell up from' sales floor unit, until some cheapskate actually bought it!