Nice Images Unkie, Seen the last one,but the middle section is great!
Dates are fine for the womens weekly ads. And yes your right,The last ad is exactly this. This is where the confusion started. with the winding down or canning of the automatic,the model 3 STD was released...At around the 128,00 mark and ran along side the plain model 4(undressed Auto as you say). It reatained the Rotomo base of earlier 2 and 2a with the inclusion of the 3.6 enine and cowl set up.
When the Automatic finished,as previously discussed the left over parts,ie bases badges and the like continued along side or with the Model 3 STD....somewhere in this period and prior to the model 5s release,the Special" Name was introduced. There have been a few examples of Specials" BEFORE the release of the model 5. So these few mowers would be the Specials and the model 3 rotomo the STD since it was a Utility or base model.
So You can look at it 2 ways...The model 3 is the true STD( Rotomo) and the model 4 ( dressed down Automatic with left over parts) is just the slightly higher model in options,having the automatic height adjust,muffler and alloy base,but to my knowledge this model 4 never had a name until the Special badge or title was released just prior to the Model 5s introduction. Truly what did the model 5 Special get that the dressed down model 4 did not? NOTHING,just a Special" badge.
Its quite unusual to have two STD models,especially when you have nothing to upsell to a customer. That last ad Depicts in text the model 4 STD,as it says with alloy base features....YET displays the model 3 Rotomo STD in the Image. I think youll find advertising fell behind production as older images were sometimes used to promote newer mowers. As you will seee in the first Images.
So if you want to use the term STD too apply to both mowers I dont think youd be inaccurate,as they model 4 version really had no title until that special badge was used also the model 4 STD if you will ran well up into the 300,000 range placing it right along side the model 5.