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I can get other photos with cowling off and badge on the rear to. I will post up later
Hello Tjames,
I can't say I can confirm this one, but it appears more
likely than not this is an original Model 35.

The issue is: did SB use a Villiers 2-stroke on their model 35 ...?
They certainly used a Kirby 2-stroke.
The badge on the rear may help.

Many thanks for raising this issue.

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Jack