The Hamburg America Line (German: Hamburg-Amerikanische Packetfahrt-Actien-Gesellschaft [Hapag] = Hamburg American Steam Packet Company) was established in 1847. Packet meant that they were contracted by national governments to regularly transport packets of sea mail.
The home port of the Hamburg America Line was the Port of Hamburg in Hamburg city and state in northern Germany.
In 1970 the Hamburg America Line merged with rival North German Lloyd to become Hapag–Lloyd AG (AG = Aktiengesellschaft ‘corporation’).
New York and Hamburg via Plymouth. Established 1847. Sailing: From New York, express service for Plymouth and Hamburg every Thursday, regular service for Hamburg direct every Saturday; from Hamburg, express service Thursdays, regular service Sundays and Tuesdays; from Southhampton, express service Fridays. Funnel—Express service, yellow; regular service, black. House flag—White and blue, diagonally quartered, black anchor and yellow shield in center bearing letters H. A. P. A. G. Night signal—Two blue lights in succession, changing from blue to white to red, shown from stern.
Hopkins, Albert A[llis], compiler and editor. 1910. The Scientific American Handbook of Travel: With Hints for the Ocean Voyage, for European Tours and a Practical Guide to London and Paris. New York: Munn & Co., https://books.google.com/books?id=8CFGAQAAIAAJ.