Hello all, a simple question : is it a pommel ?
diameter is 30 mm

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I thing that is the head of a nail for a door. In Spain it`s called "tachón", and it`s made with iron or brass.. Are used how ornament on the great doors in the spanish houses. Look the rest of welded for fit the nail at the head

Deus vos guard

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I think it's a good way, thank you for your interest Beltrán .