This World War II US Navy international numeral pennant four. It is made of wool bunting and bound with machine stitching . There is canvas binding along the hoist with hemp rope looped on both ends with wooden toggle on one. The pennant survives with some stains on the fabric and hoist from years of being rolled up and stowed away in a flag bag. Measures 32 inches (hoist) and 96 inches long.
This came to us as part of a group of US navy and international code flags from World War II with some as early as an "F" flag from the Navy Yard, New York dated June 1917!
U.S. Navy uses the international alphabet flags, numeral pennants, numeral flags, and special flags and pennants for visual signaling. These signal flags are used to communicate while maintaining radio silence. Navy Signalmen transmit messages by hoisting a flag or a series of flags on a halyard. Each side of the ship has halyards and a "flag bag", containing a full set of signal flags. Signals unique to the Navy are used when communicating with other U.S. Navy or allied forces. When communicating with all other vessels, the International Code of Signals is used. The code/answer pennant precedes all signals in international code.