Hi Gadge,
BTW, that exact 'Mayfair/storebrand mid-arch' base was used from 1971 up to 1980 at least.
The easiest way to pick these models in the Victa 'Quick parts reference 1970-1991' model list is by the catcher - this base used the Model 15.
The illustration depicts a slightly different shape catcher, but with the familiar steel strip attachment arms with integrated hooks on the end.
Is that just creative licence on the part of the illustrator or did a certain series of this catcher type really have that revised shape to mine?
Ihave always found the type 15 catcher the least attractive looking, but after using one for the first time only recently, came away surprised at how easily it empties out compared to others and how deceptively cavernous it is inside, as it looks quite squat from outside. I think buyers who chose these entry level low arch models made a very shrewd purchase indeed, even if the neighbours didn't get as easily impressed by them.
