Also notice you can insert the catcher without lifting the flap first thanks to the rear flap with the second hinged piece at the bottom. Same deal with the early thumblatch catcher models. Quietly deleted with the second iteration of the thumblatch base sold from 1976 -1992. It was more awkward having to lift the flap with the lever while coordinating attaching the catcher at the same time.
There was overlap however with the twin flap thumblatch base being sold into the 1980s as the highest end models like the Mustang and Powerplus models until the Powertorque engines took over.
Victa really deceived Australians quite a bit. I guarantee they still charged top prices for their later Powertorque Mustang models with innovations like the double flap and angle adjust handles deleted.

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!