First ask it out to dinner, meet parents etc....
There are thimbles... and then there are European mediaeval thimbles.
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The pictures aren't great for keossvin's item and we have no context for the find nor any indication of what metal it's made from. The sides are a little straighter and it's more uniform than I would expect on an item that old because they were usually made by hammering, although 'cast' is possible.