Hi Cotoroanta,
Welcome to the Forum!
Your item looks to have a very heavy blade, crudely/poorly forged, and I doubt that the blade is very sharp. I agree with IP that it resembles a hay knife.
As far as an instrument for execution, it would be necessary to bludgeon someone to death with it. Neither the point or the edge are likely to fatally wound a person unless used with extreme force. That large hilt has a nice piece of crown stag antler. The D-guard is superfluous for an execution item.
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