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"There are loads and loads of these Bronze Age penannular rings in the database, more than 150 from the whole country, yet we just don't know how they were used," says Dr Geake.

A curator has praised a metal detectorist and landowner for giving an "incredibly mysterious" Bronze Age gold penannular ring to a museum.

The penannular ring - which means it has a small part of its circumference missing - was found in north Norfolk.

An "incredibly mysterious" gold Bronze Age penannular ring has been unearthed by a metal detectorist.

About 12 gold penannular rings have been found in the county since the Portable Antiquities Scheme was set up in 1997.