Ach, highly technical manufacturing details. ..just like the good old days.
That spur indeed is for a try at a clod cracker... The small teeth ( cut on a diagonal ) was done with just a 6 inch chop saw blade, close tolerance.
I would have prefered they not be there, just for appearance. With great effort I managed to cut & grind out 2 of them...such a lot of tedious work not worth it for the others.
That knife has served the flint world well for 12 years. No plans for retirement but it could find a lifetime home in a display case with the Paleo
I have been musing on a digital watch that in addition to time & date would have an inch scale on the side..for use of documenting static flint ( not for insitu's )