Working for commercials like brand Ambassador is not a new thing to note. While Savitri was the model for Lux Soap for some time, SV Ranga Rao was the brand ambassador for Berkeley Cigarettes.
The posters used to appear on walls with SV Ranga Rao holding Berkeley Cigarette between his fingers in 60s-70s.
It's a rare thing to note but that was not prominently noticed in those days by many due to the absence of televisions.
