Here are some videos from Seven HD in 2008, which was some sort of ‘breakaway’ service running different programming to the primary Seven SD service.
7 HD Ident from 23 April 2008
7 HD Lineup from 23 April 2008
7 HD PRG from 23 April 2008
Notice how the PRG isn’t animated, it just wipes horizontally onto the screen. Also note how the program on the ‘breakaway’ HD channel is a 4:3 SD program