Interesting! But probably not a bullet, as it would burst and the "fat grooves" are too big. Perhaps a spindle whorl or umbrella tip.
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SondelSuechtig 21.10.2024
It's not a bullet. It looks more like a copper alloy than lead 🤔 no idea what it is. It reminds me a bit of a tire valve. I find them in the fields all the time.
Sondelreise 21.10.2024
Reminds me of an end cap of a curtain rod, but only a guess