Hello SB
This one will take some time.
The engine is cowled and presents as a Midget MK3.
Dating: late 1950s to early 1960s.
I can't quite make out what is cast into the rear wheels.
Please advise.
'Shearmaster' was a well-know brand name for wool shears
in NZ and AUS. I do feel that is a clue, given Coopers'
association with lawn mowers.
Cheers
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Jack