Sahel spear with European pike/lance ? head

[katana]

If British, could be the 1846 pattern .....this had long langets which could have been 'cut down'. I cannot source a picture (close-up) of the 1846 'head' to confirm the shape/size etc. Later British pattern lances were all socketted. I believe langets were a feature of German Lances so checking their patterns may help give you a more conclusive answer.

David