Hi,
Spontoons come in a variety of guises, here are two 18thC ones I have and an illustration of the halberd type. I would suggest the crosspiece on a spontoon is more decorative than utilitarian as a mortal wound need not be much more than a couple of inches a lot less than the total blade length on a spontoon.
Regards,
Norman.
P.S. It is obviously no surprise to any of us that an auction misidentified an item.
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