It is definitely a brass tip from a horsedrawn buggy's harness shaft. Allowing the shaft to drag on the ground is what eventually wears a hole through the brass tip at that angle. These objects have been discussed several times here in the What Is It? forum. In one of those discussions, our fellow T-Net ID-helper MudHut posted the photo below, showing some with a worn-through hole... and also showing that buggy harness shaft tips are still being made and sold today, for people who build authentic antique buggies.