I found this Grace Line matchbook and did a little googling. It seems that this company started out by importing bat poop to the USA, where it was in high demand, because you know we love our batshit.
Grace Line had an impressive line of cruise ships, and they flew their freak flag for decades, finally ending the cruise ship business in 1984.
You can read much more at CruiseLineHistory.com with accompanying photos.
Look at how many stops these ships made. I gotta figure the passengers needed a vacation when they got home from their vacation.