Unbound Doctor's sonic screwdriver

A sonic screwdriver was found by Bernice Summerfield at the Gateway Emporium.

History
Bernice Summerfield found the screwdriver while visiting the Emporium. She didn’t recognize the model but knew that her Doctor would. Later, the Unbound Doctor would see the screwdriver and knew what it was. (AUDIO: The Emporium at the End)