The hollowed form of the blade on many African spearheads is apparently a by product of using stone/pebble anvils.
Ref.M.J.Swanton 1973
The Spearheads of the Anglo-Saxon Settlements
ISBN 0 903986 01 9
Chap 6
footnote 6
Where this feature is noted and discussed as appearing on both Anglo-Saxon and African spearheads.
I don't normaly bother much with referrences but some people seem to like them.
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