These Celtic design ear clips are very much of the school of Alexander Ritchie of Iona, and designs with similar birds' heads can be seen on the 'A Tribute to Alexander Ritchie' website. They have the roughness and 'ancient' look of the Ritchie pieces.
They measure 5/8 inches (1.5cm) in diameter, have good strong clips and are marked simply 'Silver'. I have left them unpolished and patinated as this suits their style.
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