I saw the Powertorque models on thumb latch base as an updated continuation of the first thumb latch models from the early 70s like the VC 125 mark III and VC Mustang plus the Victa Two Stroke Hi Arch my neighbour had with the G4 125 combo with creme corsair style top and gold base. I thought the next generation Powertorque engines suited the sleek thumblatch base so well and looked even more modern in appearance and just looked like the right sort of progression fot Victa's line up.
Did you notice how the top tier Mustang engine cover (not Vortex) meets the catcher top almost like a seamless continuation, giving the mower a harmonic sleek appearance overall. The way the motor is perfectly level with the top oh the catcher to achieve that aerodynamic look to impress the Joneses with? The side pull full crank Mustang and Powerplus were the only full cranks that achieved those attributes. The Corvette almost did it but has an unnecessarily raise in the plastic around the fuel fillet that "ruins" it. The cup starter high arches do achieve the illusion of it but rise up a bit due to the top mounted starter.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!