Could you please post a photo of the top of the sight? Does the "bell" in the tower rotate or slide in any way?
---------- Post added at 04:01 PM ---------- Previous post was at 03:57 PM ----------
In the 18th C. it would probably have been a hunting-style broad knife, almost sword-like, with a straight quillon, thus effectively converting the front-end into a boar spear.
If you want to see what happens if you try to stop a wild boar with a more modern military bayonet, take a look at this:
Ungeeignete Ausrüstung kann lebensgefährlich sein (Seite 1 von 2) – Stöberhunde – Foren – Community Jagd – landlive.de
Which is why "Saüfänger" or "Hirschfänger" (google these words!) were very, very robust.