Hello Micky D
I hope a member will help here.
Attempts have been made to make sense of the numbers and letters, but after over
half a century, much of that data has suffered corruption - by engine swapping, etc.
The 'AC' one was probably supplied to the unknown number of small lawnmower
makers that used unbranded Victa engines in the 1950s, not to mention the
'store brand' Model 5s.
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Jack