Unbound Doctor's sonic screwdriver
From Tardis Wiki, the free Doctor Who reference
A sonic screwdriver was found by Bernice Summerfield at the Gateway Emporium.
History
The Unbound Doctor used a sonic screwdriver when he visited Skaro with Alistair Gordon Lethbridge-Stewart. (AUDIO: Masters of War)
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)