BECC Flags: British Code Signal Flags
This code was used during the second world war and was one of many derivations of the codes developed since the eighteenth century.
Apart from various design changes, the code uses additional square number flags which were used solely to identify the ships number with numeral pennants used for speed, course etc.
The signals are supplied in two sets; BCA (Set A) which has the more common flags and BCB (Set B) which has the remainder.