and another spear with unusual shaft

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At the risk of becoming a spear bore , here is yet another dug from 'the heap' again for which I need help in identifying. Overall length is 163 cm , of which 90 cm is the very long iron head consisting of a socket , long thin iron shaft and terminating in a small leaf shaped blade which in itself is 18 cm in length and 6 cm wide at the widest. Of note is the wooden shaft which is of a very distinctive knobbly wood.