Soveriegn of the seas, an unusual lustre cup and saucer

This very large cup and saucer is decorated with two ships, "Soveriegn of the seas" and the "Flying cloud" a very nautical piecewith lovely pink lustre finish. I would like to know how old this cup and saucer are...I wonder if they are the same period as the ships?

I cant help wondering what the motivation was for someone producing this monster cup? Advertising?