signal flag S (Sierra) 43 x 70"

Vintage salvaged ship's international maritime signal flag, used by ships in communication.  The principal system of flags and codes is the Interational Code of Signals. 

Letter / code / radio name:  
Sierra. Meaning: "Engines are full speed astern".  

Blazon: Argent, an inescutcheon azure

Synthetic material.  Stitched.  Moderate patina, moderate soil, light wear.  Smells like a ship.
Details: plastic hardware, stains.

Approximately 43" x 70".

The signal flag consists of a blue square centered on a field of white.