The first instance of partial store branded Victas were the Enhanced offerings of the Model 2 Rotomo by HG Noble stores.
They were not full Store mowers in the fact they were still branded by Victa, but had the addition of some basic extras and were adorned with the Companies plaque and service details, and sold by them.
Something like Tickford/FPV or HSV enhanced cars.
But yes, the Model 5 S3 unmarked Victas were the first true generic offerings available in Australia.
Later variants of early model Victas EG the Sheerline and Corvette have been seen in a few overseas countries, Some branded Victa, some not.
Where they exported by Victa? Ive not seen much evidence to say which models,years or amounts definitively,if at all, but were more likely 3rd party exporters offering to OS Markets in these early days.
Its not something I've researched much, so others may know the full story.
I also Just noticed Paul, that its only 20 mins from me, so I'm gonna hit it, if your not interested.