Ben Hur Rally pin badge

2001 Ben Hur Rally Lanchester Centurions Motor Cycle Club 25 mm tall Butterfly fixing Possible dating by fixing types is :- 1) 1997, 1998, 1999 and 2000 all have a standard pin type fixing 2) 2001 has a butterfly fixing 3) 2007 earliest Fine thread and round knurled nut for fixing dated badge I have