Lets go back to your ad for the Special and Auto being sold together.
Ok so lets just say for now the auto finished at 128,000. The Ad states that the Special and Auto were being sold together.
From 128,000 to the start of the model 5 series 1 at...The lowest recorded no ive seen is 188,000. But up until now the genral consensus was a start for the model 5 S1 at around the 200,000 mark.
So If the auto and Special were being sold together as the ad states,and the model 5 hadnt been released yet...what were the all the Models Between 128,000 and 200,000 when the ad Clealry states Victa SPECIAL?
This could account for up to 30,000 mowers if you take away 50% as being STDS/Rotomos.
Yes some were watered down plain model 4s with a few bits,directly after the Auto had finishedbut there is no reference or ad showing a plain model 4 offered by victa...So when the Auto finished and they already had a Std/Rotomo on offer...what was the model 4 called before the model 5 S1 statrted?
Now in saying this also The model 5 series 1 Special at the powerhouse may well be The first donated by Victa .There is no dispute to this...BUT What is its engine no? How can we know anything without the engine no? Nor do we have the Release date...What if it is sept or oct of 58? Perhaps to prove once and for all the museum needs to be contacted and the serial given?.... this would solve everything .
Neither of our theories is proof enough for accuracy...So Im not sure which way to go? I am however Happy to agree with your conclusion until it is proved otherwise.