I have an original postcard from the Anker-Line "American Post Steamer Ship...From Hamburg to New York...Every Tuesday and Friday"..I have both sides of the post card scanned and a friends helped with translating the text on the back of it from Czech to English. My g-grandparents came to the USA on this ship around 1880, so that's how I ended up with it. Handwritten on the bottom of this post card is written, "Mother arrived on this ship, 1883". I would be happy to email you a copy of the scans that I did of this postcard and the typed out document with the translation, if you're interested. This post card says the company was established "27 years ago". I don't know how old the card was when my g granparents got it, but it would have had to have been in the mid 1850's.