Hello Barryjnr
There were probably half-a-dozen (or more) logos that Scott Bonnar
used when it was a manufacturer in its own right.
SB's use of logos seem to have been introduced post WWII,
although there was clear artistic work that went into the
decals and transfers that appeared on their machines.
There is also clear evidence of Letterhead logos used
in the interwar years, and after.
There is a distinction to be made here: between company
logos and model logos.
Most appear on these ODK forums.
The 'Blue Bar' is a great way to find what you may be looking for.
I feel you will need to do the work for this request.
Is your intention to make reproductions transfers/decals?
Hope this helps.
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Jack