That description actually points pretty clearly to an old agricultural gripping tool—most likely a hay or ice tongs.
Here’s why that fits what you found:
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Heavy iron construction → built for tough, outdoor farm or storage work
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Hinge mechanism → allows it to open/close like a clamp
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Curved jaws with jagged teeth → designed to bite into something slippery or fibrous
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Barn context → exactly where tools like this were commonly used
Most likely options
1. Hay Tongs
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Used to grab and lift bundles of hay or straw
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The teeth help grip the loose material without slipping
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Often used with a rope or pulley in barns to move hay to lofts