Does anyone know how to tell the year of an old AA motor badge please?

Answer 1

The serial number is your friend!

The numbering system on the original badges was an issue number and did not relate to membership numbers. The serial number gives an indication of when it was produced as follows:

1 to 999,999 – 1906-30
A-P suffixes – 1930-45
RST suffixes – 1946-56 (Flat motorcycle badges)
WXYZA suffixes – 1956-67 (Domed motorcycle badges)
OA to OZ prefixes – 1945-57
1A-9A prefix – 1957-59
1B-9B prefix – 1960-61
1C-9C prefix – 1962-63
1D-9D prefix – 1964-65
1E-9E prefix – 1966-67