G'day Glo Mod Gadge and MF
I think the side-discharge design and engine gives this one away.
It must be a Model 35. That was the only side-throw machine
made by SB with a Briggs at this time.

Vertical pull starter means Series 9 or Series 11 Briggs (at that time).
I have to confess, I have no images of a SB Model 35 Vert-pull B&s machine.

Another curious story in the wild mower kingdom.

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Jack