Spearheads and especially Chinese spearheads are very hard to date because styles changed little over time, plus we lack a group of spears with good provenance which we can use as a dating benchmark. The patina on exposed parts like the socket is usually only a function of storage conditions, not of actual age. 

Nevertheless, here I have a spearhead that I think could be late Ming (1368-1644) by virtue of its pronounced shape.

It is heavy, well-made for Chinese work and probably a military issue. The base is rounded, then follows a "waisted" area, after which the spearhead tapers gradually towards its tip. Both edges ahead of the waisted area are sharp.

The head is forged on a socket with two multi-facetted bolsters. The cross-section above and in-between the bolsters is octagonal, while the socketed end in the bottom is round in cross-section.

Some nicks in the edge, possibly from actual use. Mild pitting a deep dark brown patina throughout.