Fender ID

The early '69s up to around #1,800 had the dent in the fender, after that they were plain, the rubber bung came in somewhere around #3,200..... R. Brett

 

The fender on the left (below) is 1973 only fender (SLIGHTLY slimmer & NO cutouts for the forks) H1D & H2A.  That on the right is 74 & up fender (has "cutouts" around the forks) H1E/F/KH500 & H2B/C.