G'day Tyler
Many thanks for your considered thoughts and link.
I had not seen that page before!

Your mention of the Turner association finally made me remember:-
https://www.outdoorking-forum.com.au/forum/u...ner-perth-royal-show-1961.html#Post79927

It is clear - now - that Withers associated itself with the big mower makers -
Turner, then Victa, then Rover.

I think Victa were keen to have their own carby on their own branded products,
but had more flexibility with their engines going to other makers.

Finding a second machine with the old carby certainly is suggestive...

Perhaps it was about disguise for product differentiation.
I guess we're not likely to know.

I don't think we have heard the end of DE Withers and Withco machines.

Many thanks for your research.
Brilliant!
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Jack