Although the Official
Diagram pattern above is from the 1913 Flag Signal Book, photographs show
that only the 1908 pattern was being worn to the start of World War
1. I have found no evidence that the 1913 pattern was changed during WW1.
The first appearance of a 1913-1948 pattern I could find is on an old
Movietone newsreel of the Victory Naval Review held at Southend on 21th
- 22nd July 1919.
The order appears to be the same on all ships up to the Red and Yellow
Deployment Pennant (31). On ships that used longer lines,the order above the Deployment Pennant appears to have been whatever flags the individual
ship chose to use.
because I cannot find a copy of any Official Flag pattern after 1913,
I cannot tell exactly when more flags were added to theofficial dress diagram, or whether there was a list of flags included on later diagrams
setting out the flags to be used when the lines needed to be extended.
1949-Official Diagram does set out the flags to be used if extra
flags need to be added.)