Predicted range Likely usage Actual patterns Date(s) used
100-999 all 900 up to and including 1915
1000-1999 all 1000 1916-1920
2000-2999 all 1000 early 1920s
3000-3999 none none
4000-4999 up to 4745 800 early to mid-1920s
5000-5999 up to 5577 600 1923-1925
6000-6999 up to 6017 20 end 1925/start 1926
7000-7999 all 1000 1926-1928
8000-8999 all 1000 1928-1930
9000-9999 up to 9726 800 1930-1931
A100-A999 all 900 1932
A1000-A1999 all 1000 1933-1935
A2000-A2999 all 1000 1935
A3000-A3999 all 1000 1936
A4000-A4999 all 1000 1937-1938
A5000-A5999 all 1000 1938-1939
A6000-A6999 up to A6018 20 1939
A7000-A7999 all 1000 1939-1945
A8000-A8999 all 1000 1945-1951
A9000-A9999 all 1000 1951-1955
B100-B999 up to B172 100 1950s
D100-D9999 up to D2589 2500 1950s-1962
S100-S9999 from S1400 to S1600 200 1950s
TOTAL PATTERNS 18840