Hello noileg

That's great info.
I guess 'worked on' means restored then?

The diaphramatic snorkel suggests a 1959 model (or later)?

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Yes, I believe the first, 1956 models, were the 15" Cub and 18" Patrol.

I have a question of the 'points under flywheel' machines.
Do you have evidence that these engines were Boundy, rather than Hurricane?

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Do you know when production ceased?

Cheers
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Jack