Still, it's a very interesting add, helps to show the full range at the time, and how they were marketed.
The first mower to introduce the 'Cut in wet' idea was the VC-160, back in 1970, as it ran flagship for the introduction of the Hi arch base.
The Vc-160 was flagship the following year, for the introduction of the Zip start principal, which coupled a recoil starter with an automatic decompression vlave, to acheve faster starting speeds.
The next big thing was the G4 carby, Whitch I am fairly sure the Twin ran flagship for, however if not, it would have been the Mustang.
If that was the case, then the G4 would have been introduced backwards!