Hello M-o-K and Sir Chook

I can only agree with Sir Chook's assessment.

I can't say whether the design originates with the Suffolk Foundry
or with Qualcast (who acquired them).

I think the design that I recognise first appeared as the
Royal Blade, the replacement for the Qualcast 16 Power Mower.

[Linked Image]

I'm thinking this became the Commodore when 4-strokes were adopted in the 1960s.

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Jack