1. spike base domed retainer on the left side is a replacement, appears to be a brass paper rivet.
2. spike/base has been removed and replaced in the incorrect orientation. Base needs to be rotated 90 degrees to the right.
3. retaining pin(s) for left side lug are broken or missing. Note position of triangular tab and compare with right side.
4. chinstrap and fittings are questionable.