Hi Nando

,
the socket worries me, being so 'open' (ie the socket 'edges' are not fully closed) the 'strength' of the shaft fixing to the 'head' would be decreased. The offset 'blade' is not often seen on spears, but is easier to manufacture.
My initial 'feeling' is that it could be agricultural

However, 'peasants' were often pressed into service as millitary combatants, being relatively 'poor', unable to afford quality weaponry, many agricultural implements were utilised or modified. Alternatively a peasant's hunting spear
Hopefully, there may be more definitive answers.....
Kind Regards David