We are not quite sure what this flag denotes. As well as the alphabet and numbers sometimes different countries would also have flags specific to their ports.
Generally all maritime nations recognise the same flag signal alphabet. They were used to spell out short messages to each other between ships. Strung end to end and hung bow to stern from the rigging they were used to dress up ships for ceremonial and festive occasions.
Today they make great coastal home decor and are meant to stand up to the ocean winds. They are all sewn not printed and this one is made from a nylon blend. Strong & light-weight.
Measures approx: 38cm x 50cm