There's information about this actual spearhead here:
https://finds.org.uk/database/artefacts/record/id/223955
The above website states this is a Type H3 Spearhead according to Swanton's typology.
If possible you should track down the following book:
The Spearheads of the Anglo-Saxon Settlements
by M. J. Swanton
http://myArmoury.com/books/item.0903986019.html
Chapters:
1. Introduction
2. Germanic Spear-types prior to the settlement
3. Derivative Forms: Series A and B
4. Leaf-shaped Blades: Series C and D
5. Angular Blades: Series E to H
6. Corrugated Blades: Series I to L
7. Summary
8. Register of associated examples
The book provides a typology of spearheads with line illustrations and maps of distribution finds plus detailed descriptions of each type.
There's some information about Swanton's typology at this website:
http://www.angelcynnreenactmentsociety.org.uk...ons-armour
Here's a better picture of the actual spearhead you posted:
https://surreymedieval.files.wordpress.com/2014/05/photo-2.jpg
There's some more information about this actual spearhead here:
https://surreymedieval.files.wordpress.com/2016/06/godalming-and-ingas-name-formations.pdf