You really are a great observer, Alexender!
Honestly I was wishing you would not ask because I don't know what it is. It looks like some amateurish later addition for what reason ever. Actually its position is too far at the rear for being the rest of a former hook. Seems like it is screwed to the barrel.
I just tend to ignore it. Nobody can explain for any possible later alteration on a 500 year-old item.
Anyway, I have added another close up.
Best,
Michael
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