Series of postcards of “Cunard White Star R.M.S. ‘Aquitania'”.
Cards are undated by the company name “Cunard White Star” was in use from 1934-1949. They are most likely pre-World War II, as the ship was put to other uses after the start of the war, so 1930-39 seems a likely date.
(More images including interior on Historic England Archive.