It is difficult to see just how beautiful this card is from the scan.
I was certain that it was a collotype until I took an 'assisted' look and saw that it was 'merely' a really/rarely excellent halftone.http://www.metropostcard.com/glossaryc.html
... "C" is for "Collotype"http://www.metropostcard.com/glossaryh.html
... "H" is for "Halftone"
Google the string [ collotype site:www.metropostcard.com ] (sans brackets) for vastly more than you want to know.
Meanwhile, as to the ship:
The origins of Aquitania lay in the rivalry between the White Star Line and Cunard Line, Britain's two leading shipping companies. The White Star Line's Olympic, Titanic and the upcoming Britannic were larger than the latest Cunard ships, Mauretania and Lusitania, by 15,000 gross tons. The Cunard duo were significantly faster than the White Star ships, while White Star's ships were seen as more luxurious. Cunard needed another liner for its weekly transatlantic express service, and elected to copy the White Star Line's Olympic-class model with a larger, slower, but more luxurious ship.
... the postmark slogan marks the "Exposition coloniale internationale"http://goscf.com/t/22899&whichpage=4#484003
... an earlier post about the RMS Aquitania by erilaz, who is welcome to this card