Hello Millipede,
I found 'Class Granted' stamped on the Passenger List of a relative emigrating to Australia in the early 1900s. I think it might be something to do with Assisted Passage Schemes. Australia, New Zealand, Canada & South Africa all had Assisted Passage Schemes to encourage people to emigrate.
Like railway travel, ship passengers travelled either 1st, 2nd or 3rd Class. In the 1800s, poor immigrants would travel steerage, which was like a dormitory with bunks down the sides. No privacy and certainly not invited to dine with the Captain!
Regards, Dod.