Shipping Under Mark
by Dick Rodger
It says "Shipping under Mark" followed by a group of initials
This might not be the right place to ask this question, but I wonder if anyone can tell me what was meant by "shipping under mark". I am reading about the early 19th century vessels that sailed between Britain and the West Indies, and this term was used, followed by a group of initials.
If you could throw some light on this I would be most grateful