Hello TonyH and all ODKers
This is a helpful and friendly forum.
Many thanks to members - who willingly help others.

Your SB Multicut is a great project - and it has heritage.
Influenced by NZ's Morrison Company, it appeared here
as a Scott Bonnar 320 Series.

This presents as a 1980s Scott Bonnar: -

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/forums/155/1/scott-bonnar-models.html

The Model, Type and Code stamped on the engine cowl will give better date.

Yes, the introduction is a good one, but please share your resto posts in: -

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/forums/107/1/other-walk-behind-rotary-mowers.html

Welcome to the forums.
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Jack