Curiously, the decorative nibs shown in the Cianci article would be excellent for stopping the string holding a guard from sliding off the end of the blade, more so than the later nib of English, or Disston, saws...
Note: Disston saws are held in great esteem in the UK, so it is probably Disston continued making them in the 'English' pattern to ensure they sold well over here...
Modern saws do not have this nib, but they are usually sold with a plastic blade guard that holds itself in place....