Small black pocket metronome with red button

I lost my small black pocket metronome yesterday around 3pm near The Forum in Norwich, East Anglia. It's a compact metronome, about the size of a credit card, in worn black plastic, with a bright red start/stop button and a tiny dent on the top-right corner. There's a white sticker on the back with the initials 'PM' I wrote there for easy identification, and the display sometimes flickers if the battery is running low. It’s sentimental to me because it was a gift from my guitar teacher and I really need it back so I can keep practicing.